8 pages matching Room and pillar in this book
Results 1-3 of 8
What people are saying - Write a review
We haven't found any reviews in the usual places.
Lead and zinc resources
Geology of lead and zinc deposits
Total availability of lead as a byproduct of primary zinc mines and deposits in market economy countries
add to totals ASARCO Australia average total costs blast furnace Broken Hill byproduct silver Canada chalcopyrite Combined methods commodity concentrates costs for producing Cut and fill DCFROR demonstrated resource deposits evaluated deposits in market electrolytic estimated long-run average evaluated as primary galena independent rounding Japan lead and zinc lead mines lead refining lead-zinc long-run average total market economy countries metal production metric Mexico mill operating costs million mines and deposits mines Undeveloped deposits mining method Namibia NAp NAp NAp NAp W NAp Open pit Peru potentially recoverable pound of zinc primary lead producing and undeveloped Producing mines Undeveloped pyrite resources and weighted-average rocks Room and pillar secondary lead sinter smelter smelting smelting and refining sphalerite stratabound Sublevel open stope sulfur sulfuric acid Sweden t/yr Table Total or average TOTAL RECOVERABLE totals shown United vertical retort weighted-average total cost Zambia zinc deposits zinc metal zinc production zinc resources