Geology
Host rockQuartzite · "Wallace Formation", "St. Regis Formation", "Revett Formation"
Structure"Osburn Fault", "Alhambra Fault is a 15 to 18 metert wide fracture zone with 0.3 to 1.2 meters of fault gouge in the footwall. The fault is steeply reverse and right lateral, strikes N50-80W, dips 55 to 65SW with St. Regis-Revett Formation quartzite in the hanging wall and Wallace Formation quartzite in the footwall.", "Big Creek Anticline (WNW) - deposit within the overturned north limb.", "Big Creek Fault", "Silver Syndicate Fault"
Tectonic setting"Belt Basin"
Alteration"A rich oxide zone in the upper part of the vein, 137 meters long and 0.9 meters wide, was mined to 91 meters depth", "Veins are surrounded by halos of disseminated minerals in the wall-rock, from the vein outward, these are zones of disseminated arsenopyrite, sericite, pyrite, and carbonate. The carbonate halo begins at 24 meters and extends out to 46 to 61 meters."
References
{Deposit:: Fryklund, V.C., Jr., 1964, Ore deposits of the Coeur d'Alene district, Shohsone County, Idaho: US Geological Survey Professional Paper 445, 103 p.}{Deposit:: Cook, E.F., 1955, Prospecting for uranium, thorium, and tungsten in Idaho: Idaho Bureau of Mines and Geology Pamphlet 102, 53 p.}{Deposit:: Weis, P.L., Armstrong, F.C., and Rosenblum, S., 1958, Reconnaissance for radioactive minerals in Washington, Idaho, and Western Montana, 1952-55: US Geological Survey Bulletin 1074-B, 48 p.}{Deposit:: Dahl, Mary Kathleen, 1981, Structural and stratigraphic control of ore through the Crescent, Sunshine, Silver Summit, Coeur and Galena mines, Coeur d'AleneDahl, Mary Kathleen, 1981, Structural and stratigraphic control of ore through the Crescent, Sunshine, Silver Summit, Coeur and Galena mines, Coeur d'Alene mining district, Idaho: Moscow, Univeristy of Idaho, MS thesis, 97 p.}{Deposit:: Radford, Norman A., 1973, Geology of the Crescent mine and its relationships to the Coeur d'Alene silver belt: Osburn, Idaho, The Bunker Hill Co., 13 p.}{Development:: Julihn, C.E., and Horton, F.W., 1936, The silver belt and the Sunshine mine of the Coeur d'Alene district: US Bureau of Mines Information Circular 6876, 16 p,}{Production:: Long, K.R.,1998, Grade and tonnage models for Coeur d'Alene-type polymetallic veins: US Geological Survey Open-File Report 98-583, 28 p.}{Reference:: MINE/DEPOSIT FILE REPORT CRESCENT MINE, KELLOGG, IDAHO, FINAL REPORT, USBM CONTRACT NO. SO221028, JAN. 1983.}{Reference:: CRESCENT MINE DATA PACKAGE. INFORMATION ASSEMBLED BY THE CRESCENT MINE STAFF OF BUNKER HILL CO. TO FACILITATE THE SALE OF THE MINE.}{Reference:: REID, ROLLAND R., THE BUNKER HILL, CRESCENT AND PEND OREILLE MINES: PROSPECT OF LONG TERM CONTINUITY}{Reserve-Resource:: CRESECENT SILVER MINES, INC. PRELIMINARY PROSPECTUS, DATED OCT. 30, 1984, P. 20.}