Bulletin, Issue 954 |
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Page 2
... average WO , content of about 65 per- cent . The production during the years 1937-40 is unknown but was probably smaller than that for 1941-42 . An ore supply adequate for continuing production for at least 2 more years at the 1942 rate ...
... average WO , content of about 65 per- cent . The production during the years 1937-40 is unknown but was probably smaller than that for 1941-42 . An ore supply adequate for continuing production for at least 2 more years at the 1942 rate ...
Page 7
... average more than half a percent of WO , are minable as tungsten ore . Unfortunately , by no means all of the green silicate rock is ore ; some of the masses that are most thoroughly altered contain practically no scheelite ...
... average more than half a percent of WO , are minable as tungsten ore . Unfortunately , by no means all of the green silicate rock is ore ; some of the masses that are most thoroughly altered contain practically no scheelite ...
Page 9
... average about 0.8 percent of WO . As there is considerable selection or sorting during the hand mining , most of the ore in place and of minable widths probably averages no more than 0.5 percent . Inspection under the ultraviolet light ...
... average about 0.8 percent of WO . As there is considerable selection or sorting during the hand mining , most of the ore in place and of minable widths probably averages no more than 0.5 percent . Inspection under the ultraviolet light ...
Page 10
... average , and their proximity to the Loma Blanca mineralization is encouraging . The micaceous veinlets provide addi- tional evidence that mineralization has been stronger in that area , and if at depth they increase in number and size ...
... average , and their proximity to the Loma Blanca mineralization is encouraging . The micaceous veinlets provide addi- tional evidence that mineralization has been stronger in that area , and if at depth they increase in number and size ...
Page 11
... average thickness of 40 centi- meters . The south end of this level lacked about 2 meters of connect- ing with the ... averages about 0.75 percent of WO3 . The ore body dips 55 ° E. and is cut by a micaceous veinlet 3 to 6 centimeters ...
... average thickness of 40 centi- meters . The south end of this level lacked about 2 meters of connect- ing with the ... averages about 0.75 percent of WO3 . The ore body dips 55 ° E. and is cut by a micaceous veinlet 3 to 6 centimeters ...
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15 meters 30 meters 40 percent adit aluminous lateritic soil analyses Areponápuchic average Baja California black calcite bodies boehmite braunite breccia calcite Camagüey cavities centimeters chemical Chihuahua chromite composition containing Cretaceous crystals depth Distrito dumps Durango east explored fault feet Fissure deposit fractures Gavilán Geological Survey gibbsite grade granite Haiti Josefina kilometers lateritic soil layers limestone Lucifer manganese deposits manganese oxides Manuel Benavides material Mesa meters deep meters long meters thick meters wide Metric tons Mexico Minas mined minerals northwest occur Parral percent of manganese percent of silica pounds probably production psilomelane quartz region reserves rhombohedron rhyolite road Rochelois Plateau samples San Antonio San Luis Potosí scheelite schist serpentine shaft silica SiO2 Sonora southeast southwest stopes strike suboptical calcite surface trail tuff tungsten twinning lamellae usable calcite valley veinlets vertical Veta volcanic rocks width wolframite zone