Results: 1 - 10 of 14
Dec 31, 1993
Open File Report
… elements and base metals such as lead, zinc, bismuth and molybdenum. … yielded 0.5 ppm silver, 54 ppm lead, 16 ppm arsenic, 120 ppm … carbonate yielded 118 ppm lead and 32 ppm antimony. Anomalous …
Feb 28, 1993
Open File Report
… copper, 184 parts per million lead, 798 parts per million zinc … copper, 29 parts per million lead, 213 parts per million zinc, … up to 3.48% copper, 12.1% lead, 19.5% zinc and 118.6 parts …
Feb 28, 1994
Open File Report
… (b) Mississippi Valley type lead-zinc deposits; and sediment … of one or more of zinc, lead, copper and nickel with, …
Feb 28, 1994
Open File Report
… and carbonate-hosted zinc-lead-silver mineralized zones in …
Jul 31, 1994
Open File Report
… Improving energy efficiency may lead to a lowering of the rate of …
Mar 31, 1988
Open File Report
… interrelated and together will lead to a synthesis of coal quality …
Dec 31, 1985
Open File Report
Aug 31, 1987
Open File Report
Dec 31, 1985
Earth Sciences Report