Commodities
PrimaryAntimony, Gold
Commodity typeM
Deposit
Deposit typeVein
Deposit sizeN
Ore controlStibnite Is Present In The Upper Workings Of The Mine. Narrow Veinlets Of Quartz, Pyrite, And Calcite Were Observed On The Lower Level Of The Mine (Smith, 1915, P. 171, 185). These Veinlets Occur In A 40-Ft.-Wide Zone In Andesite (Livingston, 1971, P. 157).
Materials
Ore mineralsStibnite
GangueCalcite, Pyrite, Quartz
Geology
Host rockAndesite
Tectonic settingThe Grand Central Mine Is Located In A Volcanic Member Of The Swauk Formation, Which Is Early Eocene (52 M.Y.) And Pre-Cascade Arc Magmatism (Tabor, 1982, Geol. Map, P. 13).
Economic & production
Development statusOccurrence
Identification
Deposit ID10055927
MRDS IDSP00139
RegionNA
Data scoreB
Coordinates47.70731, -121.42981
References
WDGER OFR 90-18HUNTTING, 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.LIVINGSTON, V.E., JR., 1971, GEOLOGY AND MINERAL RESOURCES OF KING COUNTY, WASHINGTON: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 63, 200 P., 8 PL.SMITH, W.S., 1913, THE GEOLOGY AND MINERAL RESOURCES OF NORTH-EASTERN KING COUNTY, WASHINGTON: COLUMBIA UNIVERSTIY MASTER OF ARTS THESIS, 35 P., 1 PL.SMITH, W.S., 1915, PETROLOGY AND ECONOMIC GEOLOGY OF THE SKYKOMISH BASIN, WASHINGTON: COLUMBIA UNIVERSITY SCHOOL OF MINES QUARTERLY, V. 36, NO. 2, P. 154-185.TABOR, R.W.; FRIZZELL, V.A., JR.; BOOTH, D.B.; WHETTEN, J.T.; WAITT, R.B.; ZARTMAN, R.E., 1982, PRELIMINARY GEOLOGIC MAP OF THE SKYKOMISH RIVER 1:100,000 QUADRANGLE, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 82-747, 31 P., 1 PL.