In drilling for water and oil to reasonable depths through the generally soft yielding clay and sand formation of the Coastal Plain of Texas, Louisiana,
What is the difference between CWi and DWi: WiC measures fracture strength in coarse rocks, DWi measures matrix competence in medium-size rocks.
Stoping cost is one of the largest of the items comprising the total cost of producing ore. The cost per ton of ore mined is
Table of ContentsRate of ExtractionEffect on Recovery in Ore-Dressing Plant Recovery and dilution usually are interrelated; with some methods of stoping a high recovery involves
Table of ContentsFlexibilityPreparatory DevelopmentPercent Recovery of Ore and DilutionCost of Stoping The foregoing descriptions and discussion of the different stoping methods and practices and the
Table of ContentsCosts of Drilling and BlastingComparison of Stoping MethodsUnderground Mine LightingTimbering and Handling Ore in StopesSquare-Set vs. Top-Slicing MethodsHow Much does Tramming CostCost Breakdown
Stope filling has been discussed by Jackson in an earlier paper. Filling long has been recognized as the most effective method of permanently supporting the
Drilling in stopes is done with pneumatic-feed stopers, light handheld hammer drills of the jackhammer type and heavier plugger machines, drifters of the Leyner type
Timbering in stopes ranges from occasional light props or stubs to temporarily support patches of unsafe ground to regular timbering with square sets and large
Table of ContentsVariations of Principal Stoping MethodsDrilling & Blasting of Underground StopesHow to Handle Ore in StopesBackFilling a Stope The general conditions to which each of
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