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Molalla Clay

Prospect in Clackamas county in Oregon, United States with commodities Aluminum, Iron, Silica, Titanium, Water, Free
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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. Reserves and resources
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10274357
MRDS ID OR05151
MAS/MILS ID 0410050001
Record type Site
Current site name Molalla Clay
Alternate or previous names Molalla Clay Deposit, Molalla High-Alumina Clay Deposit
Related records 10052465

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -122.54838, 45.11421 (WGS84)
Elevation 185
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Clackamas(county)

Oregon(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Wilhoit(quadrangle 1:24,000 scale)

Oregon City(quadrangle 1:100,000 scale)

Vancouver(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Molalla-Pudding(hydrologic unit)

Willamette(hydrologic accounting unit)

Willamette(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country State County
United States Oregon Clackamas

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 005 S 002 E 22 Oregon

Commodities

Commodity Importance
Aluminum Critical Tertiary
Iron Tertiary
Silica Tertiary
Titanium Critical Tertiary
Water, Free Tertiary

Materials information

Materials Type of material
Beidellite Unknown
Gibbsite Unknown
Hematite Unknown
Ilmenite Unknown
Kaolinite Unknown
Limonite Unknown
Montmorillonite Unknown
Pyrite Unknown
Quartz Unknown
Siderite Unknown

Nearby scientific data

Ore Body (1) -122.54838, 45.11421
ListMap

Economic information

Ore body information

  • Strike N45E
    Dip 08W
    Thickness 15M
    Length 1645.9M
    Width 1097.3M
    Area 179HA
    Depth to top 8M
    Field Value
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control BEDDING
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Type of Wallrock Alter. #1 OTHER
    Strike And Dip N45E:08W
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 8
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 179
    Date of Last Modification 830316

Economic information about the deposit and operations

Operation type Surface
Development status Prospect
Commodity type Both
Significant No
Discovery year 1911

Mining district

District name Mollala

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category Private

Reserves and resources

  • Type In-situ
    Estimate year 1944
    Measured 28389000mt ore
    Indicated 15692000mt ore
    Demonstrated 44081000mt ore
    Inferred 29861000mt ore
    Total resources 73942000mt ore
    Commodity Subtype Grade units Group Importance Year
    Aluminum Al2O3 26.37 wt-pct Aluminum Trace 1944
    Iron Fe2O3 8.01 wt-pct Iron Trace 1944

Comments on the reserve resource information

  • MATRIX ONE, COLUMN ONE; GRADES AND TONNAGES DEVELOPED IN HOUSE IN 1975 FROM RESERVE ESTIMATES MADE BY NICHOLS, R.L. OF THE USGS. MATRIX GRADES AND TONNAGES ARE NON- CUMULATIVE TO THE LEFT. MATRIX ONE, COLUMN TWO; IS ALSO FROM NICHOLS. THE TONNAGE AND GRADE HAS BEEN MULTIPLIED BY THE APPROPRIATE CONVERSIONS TO ACCOUNT FOR METRIC TONNES AND MOISTURE CONTENT. THE ALUMINA AND IRON ANALYSIS ARE BASED ON RECOVER- ABLE AL203 AND FE203. TI02, SI02, AND LOI ANALYSIS ARE ESTIMATES.

Workings at the site

  • Type of workings Surface
    Area 179HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method STRIP-LEVEL
    Swell Factor .4
    Percent Waste Rock 0
    Avg. Overburden Thickness 8
    Primary Material Cover SAND, GRAVEL
    Percentage 100
    Hardness of Ore SAND, SILT
    Avg. Bench Height (meters) 15
    Max. Pit Slope (degrees) 45
    Capacity 8116
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 144
    Unit Production Cost 2.23
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1979

Reference information

Bibliographic references

  • Deposit

    U.S. BUREAU OF MINES FILES (WFOC).

General comments

Subject category Comment text
Deposit DEPOSIT LIFE IS 46 YEARS AT A PRODUCTION RATE OF 2029000 TONNES PER YEAR. THE MILL CAPACITY CAN BE INCREASED ; OR ANOTHER MILL CAN BE ADDED SUBSEQUENTLY OR CONCURRENTLY AND OPERATED FOR 21 YEARS IN ADDITION TO THE CURRENT MILL; WHICH WOULD OPERATE FOR 25 YEARS. THERE ARE THREE SETS OF COSTS; ORIGINAL 1975 COSTS, COSTS UPDATED FROM 1975 TO 1979, AND COMPLETELY RECOSTED 1979 COSTS.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1992 Lindsey, David S. U.S. Bureau of Mines

Beyond USGS

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

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