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Resultados 1-5 de 59
Página 4
... would cause serious damage . Shafts . - Grubb's shaft was sunk during the year 400 feet , to a depth of 1028 feet , which was reached on the 30th April . Sinking was again resumed early in Decem- ber . It is now to be sunk to 1250 4.
... would cause serious damage . Shafts . - Grubb's shaft was sunk during the year 400 feet , to a depth of 1028 feet , which was reached on the 30th April . Sinking was again resumed early in Decem- ber . It is now to be sunk to 1250 4.
Página 5
... depth of 31 feet ; total , 1139 feet . total , 1139 feet . At the 400 - feet level two feet by 12 feet by 281 balance - bob chambers , each 37 feet , have been completed ; two chambers at 900 - feet level have also been completed . The ...
... depth of 31 feet ; total , 1139 feet . total , 1139 feet . At the 400 - feet level two feet by 12 feet by 281 balance - bob chambers , each 37 feet , have been completed ; two chambers at 900 - feet level have also been completed . The ...
Página 7
... depth was attained . The question of sinking the main shaft to a greater depth , probably to 2000 feet , remained in abeyance for a long time . Finances and other matters had to be adjusted 7.
... depth was attained . The question of sinking the main shaft to a greater depth , probably to 2000 feet , remained in abeyance for a long time . Finances and other matters had to be adjusted 7.
Página 9
... depth , though not payable , has opened out to the width which it had in the profitable zone above the 300 - feet level . The main shaft at the Austral Valley Mine is being sunk , and it is intended to sink it to 300 feet , and then ...
... depth , though not payable , has opened out to the width which it had in the profitable zone above the 300 - feet level . The main shaft at the Austral Valley Mine is being sunk , and it is intended to sink it to 300 feet , and then ...
Página 44
... depth of 300 ft . on a lode underlying 45 ° , and levels have been driven at 100 ft . , 200 ft . , and 300 ft . from the surface . Winzes connect each pair of levels . How would you determine the bearings of the drives without using a ...
... depth of 300 ft . on a lode underlying 45 ° , and levels have been driven at 100 ft . , 200 ft . , and 300 ft . from the surface . Winzes connect each pair of levels . How would you determine the bearings of the drives without using a ...
Términos y frases comunes
12 feet 20 feet 31st December accident acres adit alluvial arsenopyrite Beaconsfield boundary bruises cage carrying channel City of Hobart Coal Company copper Cox's Bight Creek crosscut east crushed depth district Ditto Ditto drive dwts east reef explosives feet feet further feet west feet wide flat fractures further west Gate reefs gelignite gold-bearing Golden Gate gossan granite ground Grubb's shaft Gully hill Hobart inches injured intersected Loane's reef lode Lyell main reef main shaft Mangana Married Mathinna Miner's Dream mineral Mount Cameron Name of Sufferer north and south north-west occur outcrop passed payable prospecting pyrites pyrrhotite quantity quartz quartz veins quartzite reef formation reef-channel Renison Bell rock sandstone schist Section shoot slate sluice South Gate stone stope strata sunk surface Tasmania Gold Tasmanian Consols tion tons truck tunnel underground underlay ventilation west reef western reef width winze Zeehan zone