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Open-pit Mine Demonstration of Ream.

Lindquist RG

NTIS: PB 257 475 Available for Reference At Bureau Libraries :48 pages

https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/PB257475.xhtml

10008097

This report summarizes all relevant findings and conclusions regarding capability of high-energy projectile impact to operate effectively in an open pit environment and to successfully handle secondary breakage and bench scale problems. A silenced, aimable, mobile projectile launcher was designed and fabricated, utilizing 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 Companys' Twin Buttes Mine near Tucson, Arizona. 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.

19760101

CP; Final Contract Report;

1976

PB-257475

A04

OFR 99-76

TCRC;

NTIS: PB 257 475 Available for Reference At Bureau Libraries

AZ;

Physics International Company