Sorry I Didn't see this.
Regarding Quarries and opin pit mines, Quarries are usually soft rock and openpit is usually hard rock, but terms are also used interchangeable. A hardrock mine doe not necessarly have to be a pit to be called an open pit - go figure. If you are designing your pit or face, things to keep in mind. Most mines up until the early eighties in the US used 50' faces, By MSHA standerds (or at least until I retired 1998 ) Your faces were supposed to be approximatly no higher than the topmost reach of your loading equip, ie: a Marion or P&H 15yd shovel would have a face height of 40 - 50 feet, A Cat 992 around 25'. For safety you would want your benchs at appx. the same width as to the face height. When I did my mine plans I would use 25' on average as that was what a 992 could safely work with without getting buried in a slide. You eat up space quit fast! I figured with a loader you need a minimum of 60' for a workin bench plus safety berm. Haul roads, inclusive of rail. Figure rod and diesel locos at a max of 6% Usually tried to hold at no more than 4%. A geared loco will pull a 12% but is usually quit a bit less. Haul Trucks should be no more than 10%, they hydroplane. I tried to keep them less than 6% for fuel economey, that extra 4% really costs in fuel and cycle times. For an 0-6-0T rod loco of 100,000 lbs you will need a minimum radius of 125'. Figure the same 0-6-0, capacity is at 1%- 640, 2%-355, 3% 235 tons. % eats up tonnage and fuel, Also to much grade and you have crown sheet problems. If they don't blow up they burn up. Class B Shay (not pacific coast version)50 ton shay, two truck, 1% 760, 2% 421, 3% 282, 4% 206, 5% 150, 6% 126, tons, working radius was around 35'
