Search Documents
Search Again
Search Again
Refine Search
Refine Search
-
Drill & Blast Implementation Case Study at Multiple Freeport-Mcmoran Sites
By L. Gutierrez, S. Gering, C. Calderon-Arteaga
"Drill and blast represent the most important, and sometimes the costliest processes in the mine. The cost of drilling and blasting operations greatly contributes to the “high cost trends of the overa
Jan 5, 2017
-
Benefits of a Good Quality Assurance Program to an Electric Utility
By W. J. Mahoney
A good quality assurance program at a coal mine or power plant is accurate, timely and consistent. The quality analysis is accurate due to a complete sampling of the coal stream loaded into the unit t
Jan 1, 1994
-
Evolution Of Sag Mill Shell Liner Design At Kennecott Utah Copper’s Copperton Concentrator
By D. W. Partridge, W. Lamb, A. E. Lamb, S. Bird
Due to the constant need to improve SAG mill performance and efficiency, extensive research into all aspects of SAG mill optimization has been performed. This paper will review the current evolution
Jan 1, 2002
-
Integrating Hydro-Fracturing Technology And Geophysics Into 3d Mapping And Extraction Of Metals In Heap Leaching; Hydro-Jex And High Resolution Resistivity ?.
By Seal. Thom
Large heap leach operations around the world contain significant under-leached metal values that present recovery challenges to operators. The first challenge is to find the location of the highest
Jan 1, 2008
-
Reduction Mechanism Of Chromite Spinel With Carbon
By A. B. Hazar-Yoruç
Ferrochromium produced by smelting chromite ores is an important alloying component in the steel industry. Ore, coke and fluxes are mixed and reacted in an arc furnace for a smelting process of ferroc
Jan 1, 2007
-
Overview of NFPA 502 Standard for Road Tunnels, Bridges and Other Limited Access Highways, 2008 Edition
By William Connell
NFPA 502, Standard for Road Tunnels, Bridges and Other Limited Access Highways establishes minimum fire protection and fire life safety requirements for road tunnels, bridges and other roadways where
Jan 1, 2008
-
Probable Cost Estimating and Risk Management
By John Reilly
Costs of complex/underground projects have been consistently underestimated and delivery on time and on budget has been problematic. This has been attributed, to inadequate cost estimates and unidenti
Jan 1, 2008
-
Design Risk Mitigations for Contract CQ028 of the East Side Access Project
By Samer Sadek, David I. Smith, Wai-shing Lee, Jeffrey L. Rice, Avelino Alonso
INTRODUCTION East Side Access (ESA) Contract CQ028 is located in the New York City Borough of Queens. The contract involves construction of a 230-meter (760-foot) long open-cut excavation with a p
Jan 1, 2007
-
The Successful Implementation Of An Expert System On An Alumina Calcining Kiln
By D. Lawrence, H. Lawrence, G. Saevil
Plant operators in the mineral processing industry have been implementing expert systems for several years now, with the intent to increase production and reduce costs. Most systems have been installe
Jan 1, 2002
-
Are Estimators Getting It Right? Comparing Actual And Estimated Costs
By J. Leinart
As is readily apparent, the reliability of the early-stage costs estimated for any mining project are critical to the viability of that project. An estimate too high might leave a potentially profitab
Feb 27, 2013
-
Experimental research on the behavior of ventilation air around shafts during a fire
The safety of personnel is the most important matter during a mine fire. However, there is not enough research on a case when a fire occurs near a shaft and the behavior of the fire gas is not well un
Jan 1, 2009
-
Geology Of Wyoming's Powder River Coal Field
By G. B. Glass
In 1996, 92.5% or 233 Mt (257.4 million st) of coal produced in Wyoming came from the Wyodak coal zone in the eastern Powder River Coal Field. While the mined portions of the zone consist of one to th
Jan 1, 1998
-
Medium-Temperature Pressure Leaching Of Copper Concentrates - Part II: Development Of Direct Electrowinning And An Acid-Autogenous Process
By J. O. Marsden
Part I in this series of papers considered the chemistry of medium-temperature pressure leaching of copper sulfide concentrates and reviewed the metallurgical testing and initial process development f
Jan 1, 2007
-
A Life-Cycle Approach to Coal Resource Analysis: Examples From the Appalachian and Illinois Basins – Preprint 97-25
By R. C. Milici
Historical production data and reserve decline rates can be used both to predict future coal production rates and to estimate when the reserve will be depleted. Reserve estimates inferred herein from
Feb 24, 1997
-
Caterpillar Moves Forward With F Series Mining Trucks
The largest investment in mining equipment in Caterpillar?s history ? The F series mechanical and electrical drive trucks ? is rapidly advancing. Caterpillar showcased the 793F and 797F mechanical dr
Jan 1, 2009
-
Impacts of Geotechnical Issues on Design of the Beacon Hill Tunnel and Station Project
By Michael S. Kucker, Stuart Warren, Robert A. Robinson, Michael J. Lehnen, David McAllister
Geotechnical conditions exposed by the phased exploration programs have had a major impact on the selection of excavation and support methods, dewatering requirements, size of openings, vertical align
Jan 1, 2005
-
Kennecott Utah Copper Smelter Modernization
By C. J. Newman
Before 1995, the smelting process at the Kennecott Utah Copper Corp. (KUCC) smelter consisted of Noranda reactors and Pierce-Smith converters. When considering expansion, it was decided that the exis
Jan 1, 1999
-
Statistical Significance Of Some Operating Parameters On Dolomite Removal From Phosphate Using Amphoteric Collector
By A. M. Elmahdy
An amphoteric collector was tested for dolomite removal from phosphate ore. The effects of some operating parameters and their significance on the flotation of dolomite were studied using statisticall
Jan 1, 2007
-
ISO 9000 Gains Ground in the Industrial Minerals Industry
By Tim O’Neil
ISO 9000 is a system of quality standards that originated in Europe in the 1980s and has since been widely adopted by manufacturing companies throughout the world. The ISO 9000 standards have received
Jan 1, 1995
-
Roof Deformation Associated with Mining of Two Panels in Steeply Dipping Coal Seam Using Subsurface Subsidence Prediction Model Mining, Metallurgy and Exploration and Physical Simulation Experiment (1cbe2caf-b863-422d-8af1-56b552bbfc8f)
By Panshi Xie, Xicai Gao, Yi Luo, Youfu Zeng, Yongping Wu, Shenghu Luo
This research investigates roof deformation and failure characteristics, as well as mechanical interaction between the panels of the roof strata above two adjacent working faces in a steeply inclined