Results: 1 - 5 of 5
Dec 31, 1972
Open File Report
… with today's technology, the overburden should not be less than … covered by 200 to 500 feet of overburden has not been included, …
Oct 25, 2018
Report
… (SV) come from estimates of the overburden pressures obtained by …
Aug 08, 2016
Data
Dec 31, 1984
Open File Report
… pits 02, 03 and 04. The bedrock overburden in many places in the …
Dec 31, 1979
Economic Geology Report
… Exploitation is uncertain as overburden is thick in many …