Geochemical trace-element and rare-earth element data from stream-sediment and pan-concentrate samples collected in 2011 in the Melozitna mining district, Tanana and Melozitna quadrangles, interior Alaska

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What does this data set describe?

1. How should this data set be cited?

   Freeman, L.K., Szumigala, D.J., Blessington, M.J., and Werdon, M.B., 2012, Geochemical trace-element and rare-earth element data from stream-sediment and pan-concentrate samples collected in 2011 in the Melozitna mining district, Tanana and Melozitna quadrangles, interior Alaska: Raw Data File RDF 2012-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

   Online Links:

   • <http://dx.doi.org/10.14509/23863>

   Other_Citation_Details: 3 p., digital download

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -154.7355

   East_Bounding_Coordinate: -152.807

   North_Bounding_Coordinate: 65.5621

   South_Bounding_Coordinate: 65.1075

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 2011

   Ending_Date: 2012

   Currentness_Reference: ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: digital data

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Point data set.

   2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0001. Longitudes are given to the nearest 0.0001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.9786982.
      

7. How does the data set describe geographic features?

   rdf2012-3-geochemical-data.csv

   Sample number, coordinates, descriptions, and geochemical data for pan concentrate and stream sediment samples. (Source: Alaska Division of Geological & Geophysical Surveys)

   Sample_Num

   Unique sample identifier (Source: Alaska Division of Geological & Geophysical Surveys)

   Generic example of sample identifier: 20YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials represent the following: 'LF' = Lawrence K. Freeman, 'Z' = David J. Szumigala, and RM23232 is an historic sample collected by the U.S. Bureau of Mines.

   Latitude

   Latitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

   Range of values
   Minimum:	65.1075
   Maximum:	65.5621
   Units:	decimal degrees

   Longitude

   Longitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

   Range of values
   Minimum:	-154.7355
   Maximum:	-152.807
   Units:	decimal degrees

   Descript

   Sample type (Source: Alaska Division of Geological & Geophysical Surveys)

   Value	Definition
   Pan Concentrate	Pan concentrate sample
   Sediment	Sediment sample

   mass_kg

   mass in kilograms. Lower detection limit 0.02 kg. No upper detection limit. (Source: Alaska Division of Geological & Geophysical Surveys)

   Value	Definition
   -1	Below lower detection limit 0.02 kg.

   Range of values
   Minimum:	0.02
   Maximum:	4.11
   Units:	kg

   Au_ppm

   Au values were obtained through fire assay and inductively couple plasma - atomic emission spectroscopy (ICP-AES) finish. Results presented in parts per million, lower detection limit 0.001 ppm, upper detection limit 10 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.001 ppm
   &>10.0	Above the upper detection limit of 10.0 ppm.

   Range of values
   Minimum:	0.001
   Maximum:	1.71
   Units:	ppm

   Pt_ppm

   Pt values were obtained through fire assay and inductively couple plasma - atomic emission spectroscopy (ICP-AES) finish. Results presented in parts per million, lower detection limit 0.005 ppm, upper detection limit 10 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.005 ppm.

   Range of values
   Minimum:	0.005
   Maximum:	0.038
   Units:	ppm

   Pd_ppm

   Pd values were obtained through fire assay and inductively couple plasma - atomic emission spectroscopy (ICP-AES) finish. Results presented in parts per million, lower detection limit 0.001 ppm, upper detection limit 10 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.001 ppm

   Range of values
   Minimum:	0.001
   Maximum:	0.007
   Units:	ppm

   Au_2_ppm

   Au values obtained by fire assay fusion of a 30-gram sample. Results presented in parts per million, lower detection limit 5 ppm, and upper detection limit is 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   ---	'---' indicates sample not analyzed for Au by this method.

   Range of values
   Minimum:	31.9
   Maximum:	31.9
   Units:	ppm

   Ag_ppm

   Ag values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) following 4-acid digestion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 100 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.5 ppm.

   Range of values
   Minimum:	0.5
   Maximum:	11.1
   Units:	ppm

   Al_pct

   Al values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 50 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	2.28
   Maximum:	9.66
   Units:	pct

   As_ppm

   As values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 5 ppm.

   Range of values
   Minimum:	5
   Maximum:	232
   Units:	ppm

   Ba_ppm

   Ba values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	70
   Maximum:	930
   Units:	ppm

   Be_ppm

   Be values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.5 ppm.

   Range of values
   Minimum:	0.7
   Maximum:	9.4
   Units:	ppm

   Bi_ppm

   Bi values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 2 ppm.

   Range of values
   Minimum:	2
   Maximum:	318
   Units:	ppm

   Ca_pct

   Ca values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 50 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	0.4
   Maximum:	5.39
   Units:	pct

   Cd_ppm

   Cd values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 500 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.5 ppm.

   Range of values
   Minimum:	0.5
   Maximum:	3
   Units:	ppm

   Co_ppm

   Co values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	2
   Maximum:	35
   Units:	ppm

   Cr_ppm

   Cr values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	22
   Maximum:	5,760
   Units:	ppm

   Cu_ppm

   Cu values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 1 ppm

   Range of values
   Minimum:	1
   Maximum:	50
   Units:	ppm

   Fe_pct

   Fe values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 50 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	1.05
   Maximum:	33
   Units:	pct

   Ga_ppm

   Ga values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 10 ppm.

   Range of values
   Minimum:	10
   Maximum:	30
   Units:	ppm

   K_pct

   K values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 pct, upper detection limit 10 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	0.13
   Maximum:	3.14
   Units:	pct

   La_ppm

   La values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	20
   Maximum:	6,300
   Units:	ppm

   Mg_pct

   Mg values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 50 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	0.06
   Maximum:	1.82
   Units:	pct

   Mn_ppm

   Mn values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 5 ppm, upper detection limit 100,000. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	232
   Maximum:	14,750
   Units:	ppm

   Mo_ppm

   Mo values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 1 ppm.

   Range of values
   Minimum:	1
   Maximum:	9
   Units:	ppm

   Na_pct

   Na values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 10 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	0.23
   Maximum:	2.15
   Units:	pct

   Ni_ppm

   Ni values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 1 ppm.

   Range of values
   Minimum:	1
   Maximum:	61
   Units:	ppm

   P_ppm

   P values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	260
   Maximum:	7,050
   Units:	ppm

   Pb_ppm

   Pb values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	11
   Maximum:	408
   Units:	ppm

   S_pct

   S values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 10 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 0.01 percent

   Range of values
   Minimum:	0.01
   Maximum:	0.06
   Units:	pct

   Sb_ppm

   Sb values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 5 ppm.

   Range of values
   Minimum:	5
   Maximum:	17
   Units:	ppm

   Sc_ppm

   Sc values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit of 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	2
   Maximum:	117
   Units:	ppm

   Sr_ppm

   Sr values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	62
   Maximum:	248
   Units:	ppm

   Th_ppm

   Th values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 20 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 20 ppm.

   Range of values
   Minimum:	20
   Maximum:	3,670
   Units:	ppm

   Ti_pct

   Ti values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in percent, lower detection limit 0.01 percent, upper detection limit 10 percent. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	0.2
   Maximum:	8.82
   Units:	pct

   Tl_ppm

   Tl values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 10 ppm.

   U_ppm

   U values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 10 ppm.

   Range of values
   Minimum:	10
   Maximum:	60
   Units:	ppm

   V_ppm

   V values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	12
   Maximum:	639
   Units:	ppm

   W_ppm

   W values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   -1	Below detection limit of 10 ppm.

   Range of values
   Minimum:	10
   Maximum:	990
   Units:	ppm

   Zn_ppm

   Zn values obtained by inductively coupled plasma - atomic emission spectroscopy (ICP-AES) analysis following 4-acid digestion. Results presented in parts per million, lower detection limit 2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Range of values
   Minimum:	12
   Maximum:	257
   Units:	ppm

   Ba_2_ppm

   Ba values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	66.9
   Maximum:	954
   Units:	ppm

   Ce_ppm

   Ce values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   >10000	Ce values are greater than the upper detection limit of 10,000 ppm.

   Range of values
   Minimum:	38
   Maximum:	9770
   Units:	ppm

   Co_2_ppm

   Co values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	1.5
   Maximum:	41.6
   Units:	ppm

   Cr_2_ppm

   Cr values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 10 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	30
   Maximum:	5,760
   Units:	ppm

   Cs_ppm

   Cs values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.01 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.55
   Maximum:	17.9
   Units:	ppm

   Dy_ppm

   Dy values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	4.83
   Maximum:	365
   Units:	ppm

   Er_ppm

   Er values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.03 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	3.03
   Maximum:	175.5
   Units:	ppm

   Eu_ppm

   Eu values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.03 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.77
   Maximum:	9.76
   Units:	ppm

   Ga_2_ppm

   Ga values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	12.3
   Maximum:	60
   Units:	ppm

   Gd_ppm

   Gd values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	4.1
   Maximum:	607
   Units:	ppm

   Hf_ppm

   Hf values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	4.1
   Maximum:	369
   Units:	ppm

   Ho_ppm

   Ho values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.01 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	1.05
   Maximum:	63.5
   Units:	ppm

   La_2_ppm

   La values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	16.9
   Maximum:	7,950
   Units:	ppm

   Lu_ppm

   Lu values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.01 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.46
   Maximum:	22.4
   Units:	ppm

   Mo_2_ppm

   Mo values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   -1	Below detection limit of 2 ppm

   Range of values
   Minimum:	2
   Maximum:	11
   Units:	ppm

   Nb_ppm

   Nb values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	11.3
   Maximum:	761
   Units:	ppm

   Nd_ppm

   Nd values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	18.5
   Maximum:	6,020
   Units:	ppm

   Pr_ppm

   Pr values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.03 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   >1000	Pr values greater than the upper detection limit of 1,000 ppm.

   Range of values
   Minimum:	4.58
   Maximum:	377
   Units:	ppm

   Rb_ppm

   Rb values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	7.5
   Maximum:	276
   Units:	ppm

   Sm_ppm

   Sm values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.03 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   >1000	Sm values greater than the upper detection limit of 1,000 ppm.
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	4.04
   Maximum:	717
   Units:	ppm

   Sn_ppm

   Sn values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   >10000	Sn values greater than the upper detection limit of 10,000 ppm.

   Range of values
   Minimum:	2
   Maximum:	3280
   Units:	ppm

   Sr_2_ppm

   Sr values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	30.7
   Maximum:	249
   Units:	ppm

   Ta_ppm

   Ta values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.8
   Maximum:	165.5
   Units:	ppm

   Tb_ppm

   Tb values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.01 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.73
   Maximum:	70.7
   Units:	ppm

   Th_2_ppm

   Th values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   >1000	Th values greater than the upper detection limit of 1,000 ppm.

   Range of values
   Minimum:	4.25
   Maximum:	746
   Units:	ppm

   Tl_2_ppm

   Tl values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   -1	Below detection limit of 0.5 ppm.

   Range of values
   Minimum:	0.5
   Maximum:	1.6
   Units:	ppm

   Tm_ppm

   Tm values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.01 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	0.43
   Maximum:	25.8
   Units:	ppm

   U_2_ppm

   U values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.05 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	1.7
   Maximum:	416
   Units:	ppm

   V_2_ppm

   V values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	11
   Maximum:	760
   Units:	ppm

   W_2_ppm

   W values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 1 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	1
   Maximum:	1,130
   Units:	ppm

   Y_ppm

   Y values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.5 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	30.1
   Maximum:	1,460
   Units:	ppm

   Yb_ppm

   Yb values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 0.03 ppm, upper detection limit 1,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.

   Range of values
   Minimum:	2.82
   Maximum:	154.5
   Units:	ppm

   Zr_ppm

   Zr values obtained by inductively coupled plasma - mass spectroscopy (ICP-MS) following lithium metaborate fusion. Results presented in parts per million, lower detection limit 2 ppm, upper detection limit 10,000 ppm. (Source: Alaska Division of Geological & Geophysical Surveys and ALS Minerals.)

   Value	Definition
   NSS	Insufficient sample available to analyze by this method.
   >10000	Zr values greater than the upper detection limit of 10,000 ppm.

   Range of values
   Minimum:	144
   Maximum:	9100
   Units:	ppm

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Freeman, L.K.
   • Szumigala, D.J.
   • Blessington, M.J.
   • Werdon, M.B.

2. Who also contributed to the data set?

   This project is part of the State's Rare Earth Elements and Strategic Minerals Assessment CIP funded by the Alaska State Legislature and managed by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.

3. To whom should users address questions about the data?
   Alaska Division of Geological & Geophysical Surveys
   c/o James Weakland
   GIS Analyst
   3354 College Road
   Fairbanks, AK 99709-3707
   USA
   

   (907)451-5029 (voice)
   dggsgis@alaska.gov
   

   Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

Fieldwork was performed to evaluate the mineral-resource potential of portions of the Tanana and Melozitna quadrangles. This sampling was conducted as part of the State's Rare Earth Element and Strategic Minerals Assessment project, which is designed to evaluate Alaska's potential for these resources.

How was the data set created?

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   Date: Apr-2012 (process 1 of 3)

   Fieldwork - For the DGGS study, major and minor watersheds (stream drainage basins) were selected for sampling prior to field work based on geographic criteria and stream-sediment geochemical anomalies in National Uranium Resource Evaluation (NURE) data. In the field, specific sample sites were selected by visual inspection from the helicopter, and were based on the availability of sample media and a suitable landing zone. Sites along streams/rivers were then selected, in order of preference from highest to lowest, as follows: gravel/cobble-armored riffles, gravel/cobble-armored point bars, log/boulder/plunge-pool eddies, point bars, overbank flood deposits, and moss mats. Where practical, sediment was collected over a 50-meter-long stretch of watercourse and combined into a composite sample. Stream-sediment samples were collected with a shovel. Cobbles and larger pebbles were manually screened out by hand, and the remaining material was placed into a permeable cloth sample bag. In order to obtain a sufficient volume of fine sediment, 7-inch-wide by 12-inch-long sample bags were filled to capacity. For pan-concentrate samples, sediment was collected with a shovel and then screened using a "Garrett's Combination Sifter" with a 0.483-inch, square-hole mesh. The resulting under-size material was collected in a 14-inch-diameter "Garrett's Gold Trap" gold pan. Sediments were screened until the gold pan was level-full with -0.483-inch material. Using alternating shaking and washing motions, the sediment was reduced to visible heavy minerals or a volume of approximately 30 ml. This concentrate was then washed into Nasco Whirl-pak plastic sample bags.

   Date: Sep-2011 (process 2 of 3)

   Sample Prep - Pan-concentrate samples were dried at DGGS using a hot plate and glass petri dishes, which were washed after each use to prevent cross-contamination. Dried samples were split manually into two, equal-size, homogeneous portions using a razor, which was washed after each use. Samples were submitted to ALS Minerals (formerly ALS Chemex), where the sediment and pan-concentrate samples were logged, air-dried at low temperature, and weighed. The samples were then sieved to a particle size of -180 microns (80 mesh). Both fractions were retained, and the -80-mesh fraction was used for analysis.

   Date: Apr-2012 (process 3 of 3)

   Sample Analysis - All samples were analyzed for ore-related trace elements and the full suite of rare earth elements. In addition to the internal quality-control program at ALS Minerals, DGGS monitored analysis quality by inserting igneous-rock and ore-geochemical-pulp standards with known compositions into the sample roster for every sample batch. Trace-element compositions were determined using inductively coupled plasma, atomic emission spectroscopy (ICP-AES) following a four-acid digestion process. Rare-earth- and additional trace-element compositions were determined using inductively coupled plasma, mass spectroscopy (ICP-MS). ICP-MS samples were dissolved in acid following lithium borate fusion. Platinum, palladium, and gold values were obtained from a 30-gram sample using inductively coupled plasma - atomic emission spectroscopy (ICP-AES) following fire assay. Sample 11RM23232P was outside the range for gold for this method, and was re-analyzed using gravimetry. Detection limits for each of the reported elemental values obtained by the various methods are documented in the metadata file.

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

   All geochemical trace-element and rare-earth-element analyses were conducted by ALS Minerals. Analytical methods and detection limits are listed in attribute definitions. In addition to the internal quality-control program at ALS Minerals, DGGS monitored analysis quality by inserting geochemical standards of known composition into the sample roster for every sample batch. DGGS staff plotted sample points and visually inspected locations to identify possible transcription errors

2. How accurate are the geographic locations?

   Location data were downloaded from Garmin eTrex Legend HCx GPS units into a Microsoft 2007 Access database.

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   This dataset contains all of the analysis for trace-element and rare-earth-element geochemistry complete at the time of publication for all samples collected in the Melozitna and Tanana quadrangles during July and August 2011. A few sample "twins" were excluded from analysis by the lab due to insufficient material.

5. How consistent are the relationships among the observations, including topology?

   not applicable

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:

This report, map, and/or data set is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).

Use_Constraints:

Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

1. Who distributes the data set? (Distributor 1 of 1)
   Alaska Division of Geological & Geophysical Surveys
   3354 College Road
   Fairbanks, AK 99709-3707
   USA
   

   (907)451-5020 (voice)
   (907)451-5050 (FAX)
   dggspubs@alaska.gov
   

   Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

   Contact_Instructions:

   Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

2. What's the catalog number I need to order this data set?

   RDF 2012-3

3. What legal disclaimers am I supposed to read?

   The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

4. How can I download or order the data?
   • Availability in non-digital form:

     DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.

   • Cost to order the data: Contact DGGS for current pricing

   • Availability in digital form:

     Data format:	CSV
     Network links:	<http://dx.doi.org/10.14509/23863>

   • Cost to order the data: Free download

Who wrote the metadata?

Dates:

Last modified: 13-Jul-2012

Metadata author:

Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:

FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:

• <http://www.dggs.alaska.gov/metadata/dggs.ext>