Commodities
PrimaryManganese, Silver, Nickel, Magnesite, Copper
Commodity typeM
Deposit
Deposit sizeN
Ore controlSee Comments
Materials
Ore mineralsBementite, Chalcocite, Copper, Cuprite, Malachite, Rhodochrosite, Rhodonite
GangueJasper
Geology
Host rockSandstone
Associated rockBasalt
Tectonic settingHost Rocks Of Manganese Deposits Of The Olympic Penninsula Formed At An Ocean Ridge Or In A Back Arc Basin At The Active Margin Of The North American Plate (Garrison, 1973; Snavely, 1987, P. 306-309)
Economic & production
Development statusOccurrence
Identification
Deposit ID10093019
MRDS IDSP00181
Alternate namesThree Friends
RegionNA
Data scoreB
Coordinates47.57507, -123.3457
References
GARRISON, R.E., 1973, SPACE-TIME RELATIONS OF PELAGIC LIMESTONES AND VOLCANIC ROCKS, OLYMPIC PENNINSULA, WASHINGTON: GEOLOGICAL SOCIETY OF AMERICA BULLETIN, V. 84, NO. 2, P. 583-594.GREEN, S.H., 1945, MANGANESE DEPOSITS OF THE OLYMPIC PENNINSULA, WASHINGTON: WASHINGTON DIVISION OF MINES AND MINING REPORT OF INVESTIGATIONS 7, 45 P., 1 PL.HUNTTING, M. T., 1956, INVENTORY OF WASHINGTON MINERALS-PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, 428 P.; V. 2, 67 P.MAGILL, E.A., 1960, MANGANESE DEPOSITS OF THE OLYMPIC PENNINSULA, WASHINGTON: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 5530, 82 PSOREM, R.K.; GUNN, D.W., 1967, MINERALOGY OF MANGANESE DEPOSITS, OLYMPIC PENNINSULA, WASHINGTON: ECONOMIC GEOLOGY, V. 62, NO. 1, P. 22-56.TABOR, R.W.; CADY, W.M., 1978, GEOLOGIC MAP OF THE OLYMPIC PENNINSULA, WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS SERIES MAP I-994, 2 SHEETS, SCALE 1:125,000WDGER OF 90-18