3 edition of Blasting Tests in A Porphyry Copper Deposit in Preparation For in Situ Extraction. found in the catalog.
Blasting Tests in A Porphyry Copper Deposit in Preparation For in Situ Extraction.
United States. Bureau of Mines.
|Series||Report of investigations (United States. Bureau of Mines) -- 8070|
|Contributions||Steckley, R.C., Larson, William C.|
New soil geochemistry and airborne magnetic data from Impact Minerals Limited's (ASX:IPT) Apsley Prospect within its % owned Commonwealth project in the Lachlan copper-gold province of New South Wales (Figure 1) have defined almost text book examples of the zonation expected around a large porphyry copper-gold deposit with three priority areas defined for follow up work. China’s copper deposits are mainly divided into porphyry-type (41%), skarn-type (27%), marine volcanic-type (%), copper-nickel (Cu-Ni) sulfide-type (%) and others (%). For complex reasons, the majority of the condition of conventional surface and underground mining for copper minerals in China are not very suitable, unlike South.
Abrasive blasting uses compressed air or water to direct a high-velocity stream of an abrasive material to clean an object or surface, remove burrs, apply a texture, or prepare a surface for the application of paint or other types of coatings. Air pressure is typically high, at pounds per square. However, the greatest potential for copper ISL extraction remains with the deep seated deposits that would otherwise be left unmined by conventional methods. This paper highlights some historical aspects of copper in situ leaching, and also reviews some commercial and experimental projects involving both oxide and sulfide deposits.
Preparation Similar to open stoping development 10% void space excavation Only development blasting required Increased extraction efficiency and reduced CO2 and SO4 emissions when using bio-leachate Appendix G of a study to assess the exploitation of a challenging porphyry Gold-Copper deposit. EMC Feasibility Study. Delft University of. Tip #10 - Estimating production rates blast cleaning. With such a wide variety of coating types and rust conditions in existence at most plant sites, how does a contractor estimate surface preparation production rates for bidding (i.e., abrasive blast cleaning, wet blast cleaning, power tool cleaning, etc.)?
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The Bureau of Mines performed a fragmentation experiment in cooperation with Duval Corporation in a porphyry copper-molybdenum deposit near the Sierrita pit south of Tucson, Ariz.
This experiment evaluated the fragmentation created in a hole test blast having blasthole spacings of. The Bureau of Mines performed a fragmentation experiment in cooperation with Duval Corp. In a porphyry copper-molybdenum deposit near the Sierrita Pit south of Tucson, Arizona.
This experiment evaluated the fragmentation created in a hole test blast having blasthole spacings of 25, 20, and 15 feet. The 10 blastholes were 9 inches in diameter and contained a total of 17, pounds of aluminized slurry blasting agent.
uses a working definition of a porphyry copper deposit. A porphyry copper deposit is defined as follows: 1. One wherein copper-bearing sulfides are localized in a network of fracture-controlled stockwork veinlets and as dis-seminated grains in the adjacent altered rock matrix; Size: 1MB.
Three case studies are presented, namely a typical porphyry copper deposit, an exotic oxide copper deposit, and a complex gold deposit, where mineralization is controlled by structures and lithology.
undiscovered resources estimated in porphyry copper deposits in six tracts located in North America. The assessment estimated undiscovered porphyry copper deposits within 1 kilometer of the land surface in three depth intervals.
The results of the updated engineering cost model analysis for open-pit porphyry copper deposits are inCited by: 7. Sedimentary copper deposits with soluble mineralization and sufficient matrix permeability can allow for ISL, as illustrated by the Nacimiento operation in New Mexico (Ahlness and Pojar, ).
The form of sediment-hosted copper deposits within sedimentary sequences is similar to some uranium deposits that are exploited by in situ leaching. Furthermore, porphyry copper deposits gain an increasing significance in the mining of gold, whereas VMS deposits supply large quantities of zinc and lead on a worldwide basis.
Porphyry deposits are the most important source for the metals copper, molybdenum and gold (more than 50% of the globally mined copper comes from porphyry systems). blasting cap when unconfined; and Blasting agent (BA) = a mixture consisting of a fuel and oxidizer, intended for blasting but otherwise not an explosive (cannot be detonated with a No.
8 blasting cap). The makeup of a standard-test No. 8 cap, of the sort used as a detonator in the blasting industry, is shown to the right. So how do we explore for Porphyry Copper Deposits which are completely covered by barren younger rocks. Well let’s back up a bit, we know that porphyries form under large subduction related volcanoes and that most of these are located under the ring of fire around the subducting pacific plate another fertile subduction zone occurs in Balkans, Turkey, Iran and Pakistan.
So this gives us a. Understanding Geology of Porphyry Copper Deposits and formations using models around the World. Porphyry Copper Deposits are the largest source of Cu/Mo/Au. The in situ recovery Gunnison Project and North Star porphyry copper deposit that it exploits are located in Cochise County, Arizona, ~ km east of Tucson and km southeast of the historic Johnson Camp mining district.
Although no direct mining had historically been undertaken over of the North Star deposit, the district has been the subject of early copper, zinc, silver and tungsten.
The major products from porphyry copper deposits are copper and molybdenum or copper and gold. The term porphyry copper now includes engineering as well as geological considerations; It refers to large, relatively low grade, epigenetic, intrusion-related deposits.
INTRODUCTION In the Bureau of Mines conducted a fragmentation experiment in cooperation with the Duval Corp. to determine the feasibility of breaking up, in place, a porphyry copper--molybdenum deposit in preparation for in-situ leaching (D'Andrea et al., ).
The ore at Kennecott contained an amount of copper equivalent to a million-ton typical porphyry copper deposit, which is currently one of the primary types of copper deposits being mined worldwide.
The Kennecott deposits were an economically attractive target for exploration. Blasting tests in a porphyry copper deposit in preparation for in situ extraction Steckley, R.C., Larson, W.S., and D'Andrea, D.V.,Blasting tests in a porphyry copper deposit in preparation for in situ extraction: U.S.
Bureau of Mines Report of Investigations R.I.47 p. porphyry copper deposit in Chile where the variogram of 3-meter long drill hole samples is compared to meter long blast hole ones and we show that the blast holes can be assumed to regularizing the point information deduced from the drill holes, except for a nugget effect specific to the blast samples.
Pebble Mine is the common name of a very large porphyry copper, gold, and molybdenum mineral deposit in the Bristol Bay region of Southwest Alaska, near Lake Iliamna and Lake Clark.
As of Augustmine developers are seeking federal permits from the U.S. Army Corps of Engineers, the U.S. Coast Guard and the Bureau of Safety and Environmental Engineering.
preparation of a material Safety in Abrasive Blasting: Ma 4. aluminum, stainless steel, galvanized steel, copper-nickel and other copper alloys • Surface Coatings – e.g., pre-construction primers, anticorrosive and antifouling paints • Abrasive Blasting Media – e.g., coal slag, copper slag, nickel slag, glass, steel grit.
InBHP initiated, but did not complete, a multi-month, field-optimization in-situ recovery test to gather copper-extraction and other technical data.
The project obtained all major environmental permits under BHP in the late s and Florence Copper is currently in the. Blasting tests in a porphyry copper deposit in preparartion for in situ extraction / ([Pittsburgh, Pa.]: U.S.
Dept. of the Interior, Bureau of Mines, ), by Robert C. Steckley, Dennis V. D'Andrea, William C. Larson, Twin Cities Research Center (United States. Bureau of Mines), and United States.
Porphyry - Any igneous rock in which relatively large crystals, called phenocrysts, are set in a fine-grained groundmass. Porphyry copper - A deposit of disseminated copper minerals in or around a large body of intrusive rock. Portal - The surface entrance to a tunnel or adit.
Portfolio -. This is true for a number of porphyry copper deposits. Prolonged weathering of a sulphide ore deposit results in a vertical zonation that comprises a leached/oxidation zone and a metal-rich cementation zone (supergene blanket), grading into unaltered mineralized rock of the primary zone (parent) (protore) (Hypogene zone).
Most of the world’s copper is extracted from a type of mineral deposit called a “porphyry copper”. If you’ve seen a picture of a great big open-pit mining operation odds are that it was a porphyry copper deposit.
Some of the biggest man-made holes in the ground are porphyry copper mines: Bingham Copper Mine, Utah, and Chuquicamata in Chile, and two of the largest.