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Recent content by Backfill
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Hydraulic transport of ore
I've got a 1974 collection on slurry - Proceedings of Hydrotransport 3 (BHRA Fluid Engineering, ISBN 0 900983 37X), so yes, the concepts and practice have been around for some time. You probably already have done this, but give a crack at hydrotransport or hydrohoist slurry transport out on the...- Backfill
- Post #4
- Forum: Mining engineering
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Drop Box Design
Chris, Our background and experience with tails is primarily stability, hydrology, liner systems and subaerial deposition. My observance has been that drop boxes generally are three to four pipe diameters, with the outlet two to three box diameters above the sill (floor) of the box. The pipe...- Backfill
- Post #4
- Forum: Mining engineering
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Drop Box Design
chogben, It has been a bit since I dropped in to look through some of the queries. Hope this still is timely. 1. What material are you dropping? Ore, aggregate or binder (types, gradation), slurry (percent solids, grind), liquid? 2. What is your drop height and conduit size/shape? Since you...- Backfill
- Post #2
- Forum: Mining engineering
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On tailings dams
Cansand, General literature searching will turn up lots of stuff, but bear in mind these systems are dependent on ore (and gangue) type, process (grind, reagents, etc.), climate, site (foundation, basin/valley/canyon slopes, etc.), liner requirements, seismic regime, etc. A recent and fairly...- Backfill
- Post #2
- Forum: Mining engineering
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Rock Classification Slope Design Cohesion Value
cap4000, Do you need substance(intact rock) or fracture cohesion values? Both is usually the right answer. Failure is so often in the degree, pun intended. What can you live with, what can you operate with? If you're looking at a hospital above or below the cliff, or it's a bridge or...- Backfill
- Post #2
- Forum: Mining engineering
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Resource evaluation software
rrhysevans, Not sure what your level of investigation and involvement are, so... Try some of the links at: www.smenet.org and www.infomine.com. Possibly www.ggsd.com, but I don't recall how extensively they get into the resource/reserve issues. Many of the mining schools will be up to speed...- Backfill
- Post #2
- Forum: Mining engineering
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Discrete Element Modeling
DustController, These two general sources may lead to other, also useful, software: www.smenet.org www.bulk-online.com (Try their thread titled Chute Design Handbook) The Conveyor Equipment Manufacturer's Association may have useful literature/ads as well. The folks at Conveyor Dynamics...- Backfill
- Post #3
- Forum: Mining engineering
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Keep Spreadsheets in the office
Here are two views as employee and employer: -When I was employed with one or another of the majors, the spreadsheets pretty much were always open to others on staff or within the corporation. A few folks always seemed to think there were corporate or professional secrets, but as a rule the...- Backfill
- Post #17
- Forum: Professional Ethics in engineering
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tunnel ventilation and lighting
The SME Mining Engineering Handbook has chapters addressing these. Nice doesn't come to mind, but reasonably comprehensive. You may want to try their website at www.smenet.org. Their links are a good place to start. The Underground Construction Association of SME pulls together some groups...- Backfill
- Post #3
- Forum: Structural engineering general discussion
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Wear Resistant Redux - Polleke's Chutes
Thank you for the information. It appears very applicable to our circumstance. Merry Christmas.- Backfill
- Post #3
- Forum: Material engineering general discussion
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Wear Resistant Redux - Polleke's Chutes
This query follows from the closed thread 342-130950 'Wear Resistant Material for Coal Chutes' One reply may fit very closely to a problem facing me. This is from Polleke(Mechanical), dated 4-Oct-05. Your tonnage rates may be applicable if you could relate the gradation, or even the topsize...- Backfill
- Thread
- Replies: 2
- Forum: Material engineering general discussion
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Timeframe for Boom in Commodity Prices
RobPE: Recognize this reply is from a recovering geologist become engineer... I think the timeframe will hinge primarily on demographics, which definitely are out of the realm of this forum. But I bet the demographers are simply scaling up the take-off points for the industrial and green...- Backfill
- Post #3
- Forum: Mining engineering
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Cast-iron Segment Lining - Standard Dims/Specifications
RCDLtd: Though not a tunneling expert per se, in thirty years of mine engineering I've never run across anyone using cast iron liners. The most recent references I've noticed are just before the Great War (I did my initial search on 'Cast Iron Tunnel Segments'). On the other hand, lots of...- Backfill
- Post #2
- Forum: Mining engineering
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Topics for discussion
gump13, Have you tried some of the safety-focused regulatory groups: MSHA, OSHA, and others? They often have data available for the asking. MSHA is quite open with their 'fatalgram' packages, along with a considerable amount of training packets or packages, often directed at weekly or toolbox...- Backfill
- Post #3
- Forum: Soil/Groundwater environmental engineering
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Methane Removal, Pipe - PVC vs HDPE
GeneralAssociate, Hopefully I understand enough of your query to respond intelligently: 1. 4" perforated PVC may calculate out to be too brittle/fragile to withstand settlement. 8,500 lf of removal line tells me its a fairly large slab (or sets of slabs), so there will be a bit of rockin &...- Backfill
- Post #2
- Forum: Mining engineering