The Mines of ColoradoSamuel Bowles & Company, 1867 - 450 strani |
Iz vsebine knjige
Zadetki 1–5 od 100
Stran 108
... shaft , and shown where to fill a pan of dirt , which they did . They closely watched its washing , and were , we suppose , painfully surprised to have all their con- clusions upset by finding $ 8.68 in the pan . They thought they would ...
... shaft , and shown where to fill a pan of dirt , which they did . They closely watched its washing , and were , we suppose , painfully surprised to have all their con- clusions upset by finding $ 8.68 in the pan . They thought they would ...
Stran 145
... shaft is on No. 2 , and is strongly timbered . A six - inch pump removes the water from the entire mine . On No. I there is also a shaft , now 330 feet deep , opening on the surface in a 20 - stamp mill . The hoisting and pumping are ...
... shaft is on No. 2 , and is strongly timbered . A six - inch pump removes the water from the entire mine . On No. I there is also a shaft , now 330 feet deep , opening on the surface in a 20 - stamp mill . The hoisting and pumping are ...
Stran 146
... shaft is being carried down in time for the fourth level . Dump cars convey the ore to the shaft on tramways , there is little or no water in the mine , and it is worked very economically , * In the Bob- tail mine , operations are ...
... shaft is being carried down in time for the fourth level . Dump cars convey the ore to the shaft on tramways , there is little or no water in the mine , and it is worked very economically , * In the Bob- tail mine , operations are ...
Stran 147
... shaft contains . a nine - inch pump , which easily drains the mine . There is a hoisting shaft on 7 , 280 feet deep , and between 5 and 7 a winze for ventilation . There is also a shaft on 4 , the bottom of which is expected to be ...
... shaft contains . a nine - inch pump , which easily drains the mine . There is a hoisting shaft on 7 , 280 feet deep , and between 5 and 7 a winze for ventilation . There is also a shaft on 4 , the bottom of which is expected to be ...
Stran 148
... shaft always sunk in advance , levels run , and the process repeated every ten fathoms forever . Forty men are drifting and sinking shafts , and enough ore is being taken out to run a 60 - stamp mill . Worked on the system inaugurated ...
... shaft always sunk in advance , levels run , and the process repeated every ten fathoms forever . Forty men are drifting and sinking shafts , and enough ore is being taken out to run a 60 - stamp mill . Worked on the system inaugurated ...
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