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Details

Open-Pit Mine Demonstration of Ream.

PB257475

Publication Date	1976
Personal Author	Lundquist, R. G.
Page Count	58
Abstract	This report summarizes all relevant findings and conclusions regarding capability of high-energy projectile impact to operate effectively in an open pit mining environment and to successfully handle secondary breakage and bench scale problems. A silenced, aimable, mobile projectile launcher was designed and fabricated, using a Government-furnished smooth-bore, 90 mm cannon. The silenced launcher was tested at the contractor's test site prior to shipment to ANAMAX Mining Co.'s Twin Buttes mine near Tucson, Ariz. Demonstration tests were conducted at an inactive waste dump in the mine on 39 oversize boulders to determine the relationship between boulder size and projectile energy required for secondary breakage. The high energy projectile impact method was tested on an additional 23 boulders in the working mine and on 31 areas of potentially loose rock high on the pit walls. Most of the secondary breakage tests were successful and acceptable for open-pit mining purposes without producing large amounts of fly rock.
Keywords	Open pit mining Rocks Breaking Guns(Ordnance) Silencers Fragmentation Firing tests(Ordnance) Rapid excavation and mining REAM guns
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 79G - Guns
Corporate Authors	Physics International Co., San Leandro, Calif.; BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	197624
Contract Number	H0252011

Open-Pit Mine Demonstration of Ream.

Open-Pit Mine Demonstration of Ream.
PB257475

Publication Date	1976
Personal Author	Lundquist, R. G.
Page Count	58
Abstract	This report summarizes all relevant findings and conclusions regarding capability of high-energy projectile impact to operate effectively in an open pit mining environment and to successfully handle secondary breakage and bench scale problems. A silenced, aimable, mobile projectile launcher was designed and fabricated, using a Government-furnished smooth-bore, 90 mm cannon. The silenced launcher was tested at the contractor's test site prior to shipment to ANAMAX Mining Co.'s Twin Buttes mine near Tucson, Ariz. Demonstration tests were conducted at an inactive waste dump in the mine on 39 oversize boulders to determine the relationship between boulder size and projectile energy required for secondary breakage. The high energy projectile impact method was tested on an additional 23 boulders in the working mine and on 31 areas of potentially loose rock high on the pit walls. Most of the secondary breakage tests were successful and acceptable for open-pit mining purposes without producing large amounts of fly rock.
Keywords	Open pit mining Rocks Breaking Guns(Ordnance) Silencers Fragmentation Firing tests(Ordnance) Rapid excavation and mining REAM guns
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 79G - Guns
Corporate Authors	Physics International Co., San Leandro, Calif.; BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	197624
Contract Number	H0252011