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Tofty Tin Belt

Past Producer in Alaska, United States with commodities Gold, Niobium (Columbium), Silver, Tantalum, Tin, Tin, Tailings
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10111669
MRDS ID A010745
MAS/MILS ID 0020480032
Record type Site
Current site name Tofty Tin Belt
Alternate or previous names Woodchopper Creek, Tofty Gulch, Cache Creek, Deep Creek, Miller Gulch, Idaho Gulch, Sullivan Creek, Patterson Creek, Dalton Gulch, Hokeley Gulch
Related records 10100950

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -150.88226, 65.09541 (WGS84)
Elevation 183
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tanana A-2(quadrangle 1:63,360 scale)

Tanana SE(quadrangle 1:100,000 scale)

Tanana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
Fairbanks 003 N 016 W 01 N2NWNE Alaska

Commodities

Commodity Importance
Gold Primary
Niobium (Columbium) Critical Primary
Silver Primary
Tantalum Critical Primary
Tin Critical Primary
Tin, Tailings Critical Primary

Materials information

Materials Type of material
Anatase Unknown
Apatite Unknown
Augite Unknown
Barite Unknown
Brookite Unknown
Cassiterite Unknown
Copper Unknown
Diopside Unknown
Epidote Unknown
Feldspar Unknown
Garnet Unknown
Gold Unknown
Hypersthene Unknown
Ilmenite Unknown
Magnetite Unknown
Monazite Unknown
Picotite Unknown
Pyrite Unknown
Quartz Unknown
Sphene Unknown
Tourmaline Unknown
Zircon Unknown

Nearby scientific data

Ore Body (1) -150.88226, 65.09541
ListMap

Economic information

Ore body information

  • Strike N60E
    Dip 00N
    Thickness 1M
    Length 9600M
    Width 300M
    Area 65HA
    Depth to top 15M
    Field Value
    Type of Orebody #1 PLACER
    Shape of Orebody #1 IRREGULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control BEDDING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N60E:00N
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 15
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 65
    Date of Last Modification 860825

Economic information about the deposit and operations

Operation type Placer
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1906
Year of first production 1911

Mining district

District name Hot Springs District

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Private Lease
Type of mineral rights Patented

Land status

Ownership category State

Ownership information

  • Type Owner-Operator
    Owner Jack Neubauer
    ID 5000299
    Home office Alaska
    Year 1981
  • Type Owner
    Owner Hanson, Robert L.
    ID 5000299
    Home office Alaska
    Year 1981

Comments on the ownership information

  • OWNER-OPERATOR ADDRESS: CASSITERITE PLACERS, INC. JACK NEUBAUER MANLEY HOT SPRINGS, ALASKA 99501

Production statistics

  • Year 1915
    Description Cassiterite Averaged 60% Sn. 95 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 3004g/mt
    Major Tin Tin 60wt-pct
  • Year 1917
    Description Produced During Period 1972-1980 7 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 221g/mt
  • Year 1917
    Description Production Reported 1 Troy Ounces Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 32g/mt
  • Year 1918
    Description 33 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1044g/mt
  • Year 1918
    Description 5 Troy Ounces Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 158g/mt
  • Year 1919
    Description 62 Troy Ounces Silver
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 1960g/mt
  • Year 1919
    Description 259 Yards Processed. 378 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 11950g/mt
  • Year 1920
    Description 1,533 Yards Processed. 605 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 19130g/mt
  • Year 1921
    Description 1,111 Yards Processed. 78 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2467g/mt
  • Year 1924
    Description 20 Troy Ounces Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 633g/mt
  • Year 1956
    Description Cassiterite Averaged 60% Sn. 280600 Pounds Tin
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Tin Tin 60wt-pct
  • Year 1980
    Description Produced During Period 1972-1980. 102000 Pounds Tin

Reserves and resources

  • Type In-situ
    Estimate year 1961
    Indicated 1162000mt ore
    Demonstrated 1162000mt ore
    Inferred 963000mt ore
    Total resources 2125000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 0.1561 wt-pct Tin Major 1961
    Tin Sn 0.0573 wt-pct Tin Major 1961
    Gold Au 0.57 g/mt Gold Major 1961

Comments on the reserve resource information

  • R1=M1C1 RESERVE REC 1 EQUALS MATRIX 1 COLUMN 1. AU ASSAY REFLECTS TAILING VALUE ONLY. Q2C1=N/CUM MATRIX 2 COLUMN 1 IS NON-CUMULATIVE. MATRIX REFLECTS IN-PLACE PLACER GRAVELS. Q3C1=N/CUM MATRIX 3 COLUMN 1 IS NON-CUMULATIVE. MATRIX REFLECTS TAILINGS RESERVES. Q4C1=Q3C1+Q2C1. ASSAY VALUES CALCULATED BY PROPORTIONS.

Workings at the site

  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method ALLUVIAL MINING
    Avg. Overburden Thickness 12
    Primary Material Cover SAND, SILT
    Secondary Material Cover SAND, GRAVEL
    Hardness of Ore SAND, GRAVEL
    Capacity 57
    Capacity Units CU-M ORE/DAY
    Operating Days per Year 120
    Operating Shifts per Day 1
    Year of Information 1980
  • Type of workings Surface
    Area 288HA
    Field Value
    MAS Development Schedule # 2
    Mining Record # 2
    Status of Mining Method PROPOSED
    Mining Method ALLUVIAL MINING
    Swell Factor .11
    Percent Waste Rock 88.8
    Avg. Overburden Thickness 12
    Primary Material Cover SAND, SILT
    Secondary Material Cover SAND, GRAVEL
    Hardness of Ore SAND, GRAVEL
    Avg. Bench Height (meters) 0
    Capacity 1500
    Capacity Units CU-M ORE/DAY
    Preprod. Stripping Vol. 300
    Unit Production Cost 2.75
    Units of Production $/CU-M ORE
    Operating Days per Year 120
    Operating Shifts per Day 2
    Year of Information 1980

Reference information

Bibliographic references

Comments on the references

  • BUNDTZEN, T.K., 1981, PRIVATE COMMUNICATIONS

General comments

Subject category Comment text
Deposit USGS CRIB A003572 USGS CRIB W000017

Reporter information

Type Date Name Affiliation Comment
Reporter 19-JUL-1995 Rdc U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.