Browse TRAIL Inventories

Use of the churn drill at lime-plant quarries

Progress report on investigation of detachable rock-drill bits

Hot milling of rock-drill bits at the mines of the Vinegar Hill Zinc Co., Platteville, Wis.

Progress report no. 2 on investigation of detachable rock-drill bits

Progress report 4 on investigation of detachable rock-drill bits

Progress report no. 3 on investigation of detachable rock-drill bits

Relation of dust dissemination to water flow through rock drills

Diamond-drilling blast holes, eastern Magnetite Mine A

Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.

Shaft sinking by diamond drilling, Bellefonte mine, National Gypsum Co., Centre County, Pa.

Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.

Diamond-drilling blast holes, Eastern Magnetite Mine C

Diamond-bit performance in sandstone

Noise from pneumatic rock drills :analogy studies of muffler designs

Investigations of stresses in a drill bit and rock under static loads

Accuracy in estimating metal content and tonnage of an ore body from diamond-drill-hole data

Drillability studies :statistical regression analysis of diamond drilling

Drillability studies :impregnated diamond bits

Drillability studies-laboratory percussive drilling

Energetics of percussive drills

Effect of organic additives on impregnated diamond drilling

Noise abatement of pneumatic rock drill

Noise reduction of a pneumatic rock drill

Design of a compact muffler for a jumbo drill

Lightweight fiberglass feed leg for hand-held pneumatic percussion rock drills

Zeta potential control for simultaneous enhancement of penetration rates and bit life in rock drilling

Abrasive-enhanced water-jet drill for hard rocks

Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life


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