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12 feet 135-foot level 275 Formation Overburden 50 feet amount of fluorite Analysis Formation barren fault zone brecciated calcite Bureau of Mines CaF2 Zn Pb calcite vein calcite veinlets chert collar Columbia and Davidson Columbia shaft contained less Craighead brothers creek Davidson shaft dirt and boulders drilled elevation encountered a narrow erite Eureka explored the fault fault 4a feet Froro feet lower feet north feet Sample recovery feet south feet vertical depth feet wide fine-grained fluorite and sphalerite fluorspar Formation Llenard fractured zone Fredonia gangue Genevieve Gore Hardin Hardinsburg Hole 75 Hole 92 Krausse Estate Lamprophyre dike Limestone and shale limestone breccia cemented Location in hole Louis Marion Mary Belle medium-grained mineral numbers oolitic percent CaF2 Percent Type sample percent zinc pyrite Reed shaft Renault Rock Shaft shown on figure Sludge small quantity tons trace of fluorite trace of sphal truck to custom vertical.depth Vienna virtually barren Waltersburg wide and contained