The Perm mine deposits in Calaveras County, Calif., are in slightly metamorphosed Jurassic volcanic rocks and intrusive quartz porphyry, Bedding, schistosity, and cleavage strike northwest and dip steeply northeastward. Two main types of faults are present: high-angle schistosity faults, and younger low-angle reverse faults. There are six main alteration zones, in which rocks have been sericitized, silicified, and pyritized. The ore bodies are sulphide replacement deposits either at contacts of.alteration zones, or along.faults within these zones. The ore bodies are steeply pitch-'"' ing lenses. Their pitch length ranges from 150 to 1,000 feet; breadth, from 100 to AGO feet; width,; from ^4 to^30 feet. The ore is a mixture of pyrite, sphalerite, chalcopyrite,-and a little bornite and tetrahedrite, Gangue minerals are barite, calcite, and quartz. t; Reserves.are estimated to be 245>100 tons of minings-gradevore^ and from 913>000 to £73,000 tons of low-grade ore. Two: types of areas favorable for exploration are listed: (1) extensions of kncwrLjore bodies, and (2) locations considered geologicalZy>ffayorable for the existencejof ore boidiesi? ^twarranted by the demand ifor copper and zinc, exploration of-these areas vis recommended.
Public Inquiries Off/ci QEOLOGT Of TOJ5 BAIL tOUBSKMUM PHOPl-HTT, KTS COUK7T, KH7ADA fir Charlea A* Jtodaraon and II* W« Cox 1943 Ra^laod Oatobar Abatraat Th» Hall aolybdanua property baa boan aattanalmtjr «xplor«d ground by th« U. S« Vanacdua Corporation^ and safftalant axpoauraa ham bo*n ravaalad to ladloata 1,300,000 tona of Infterrad ora with a grade of 0.3-0.37 paromt itoSj. &iaart Sllv«r, Inc., agimt tat ^rtaXa Haaarvo Coi^any, did additional «xploration la 1943* obtalninf noro 1»» foraation on tha cxt«nt of th« oro body* Idea aehlat and Mrioltle quartaita ara xmorniforBably orerlaln by liaaatoaat locally alHolTUd. Tha aehlat and Htttaton* ara Intnidad by a wall alaakita atook. Tha bordar of tha alaaldta contalna many barren quarti vclna, at ,plac«» with a parslatact orientation. ^i« «lca chl»t and locally tha Uoaatona contain nany quarts veln» at tha alaakito eontaet* Tha axpoaad Molybdmilta nlnarallmation la 11»Had to tha qttart*-**lnad sehlat at tha alaakita contact, but aona Melybdanlta ooeora In random cpiarts rtlna at tha bordar of tha alaakita. Andaai&a dUma parallel tha mliMurtillMd sona la part, but ara daflnltaly latar than tha IncrallsatloA. Thay aro broken by latar fault a. Tha alartrfta^tchlat eoataet la tha favored aona of ttolybdenlta eoooeotratlon, and farorabla targeta for artdttlanal e^loratlon ara Indioated la aeetlona aaat of tha preaent ondergroimd ivorkinga «feara the) aon* taot la aonoaaXad under limestone or quarts.
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