Scotty "10 loads per day". Yes, agreed not a great burden on the network. Though I knew there would have to be "nonhazardous, non-inert materials" taken off site, I'm surprised at this 200,000m^3 figure, I recall earlier figures of ~30,000m^3. FMU the tricky stuff identified is pyritic mudstone and halite. From the North shaft (SM11) log, p14: http://planning.northyorkmoors.org.uk/MVM.DMS/Planning%20Application/810000/810327/NYM-2013-0835-FL%20Hydrological%20Risk%20Assessment.pdf there is 93m of pyritic and ~120m of halite on the way to the polyhalite. For 2 x 7m diam shafts that adds up to ~17000m^3. If you add in another 93m of pyritic from a 9m diam MTS DN access shaft down to 350m bgl that adds another 6000m^3. Then add in a, what 5m diam? exhaust shaft to the 1480m bgl working level that adds ~4000m^3 more. Total only a max of ~27000m^3. With the chambers not going down enough to run into pyritic (starts 250m down), can all this extra be coming from the MTS tunnel? At 6m diam gives ~28000m^3 per km (from the pres: "0.3 million m3 from MTS tunnel section"). So yes, it is looking like all the MTS spoil from pretty much all the way to Lady Cross is coming up at DN (tunnel within Redcar mudstone so much pyritic) and is going off site. The q is will that be the case now for the spoil from the other MTS shafts as it is also much pyritic, a total of ~1.2million m^3? How they would deal with the pyritic was my primary q for the MTS q&a, they plan it is landscaped on site, sec 3.2: http://www.siriusminerals.com/site/assets/files/2063/140320_-_mts_qa-1.pdf GK.
Hi GK, Yes - not easy unless you are a rocket scientist but whichever material you use for comparison (you used the worst case which is good) which equates to about 3000 loads for 200000 m3. ATB Why 1/2p down this am do you think?
Hi SC Wonderful site - they go out of their way to make things difficult for them selves IMO. Best approximation I guess to what YP will want offsite: "Earth, soft loose mud", "tons/yard" (t/yrd^3) = 1.458. 1 ton = 0.9072tonne, so 1.322 tonnes/yrd^3. 1 yard = 0.9144m so 1 yrd^3 = 0.7646m^3. So "Earth, soft loose mud" comes out at a density of 1.73tonnes/m^3. AFAICT. ATB. GK.
Morning Morning (is there an echo?) :-) Agreed in ground material density = ~2.2 (I believe the materials they want offsite are pyritic mudstone and halite) and agree a bulking factor of ~1.2 so the muck that goes into trucks will have density of ~1.8. However your sum is pants. Sorry. 200,000m^3 in ground bulks up 20% to 240,000m^3 for trucking, that has a density of ~1,8, so that's ~430,000t. ~14000 to 15000 30t loads. ATB. GK.
GK: Great find this presentation. Thanks. Some broad numbers on the excavation: One has to convert volume to tonnes. I am assuming that he 200,000 m3 'to be transported off the mine site' is excavated material so loosely packed rather than in situ which is densely packed and undisturbed. The specific gravity of alluvial clay (or more properly silt) and topsoil is approximately 2.40. Others soils show a SG of 1.8 to 2. So, depending on the local excavation (could be rock in the soil), 2.2 seems to be a reasonable number. Excavation usually results in a less densely packed material, reducing the SG as the excavated material is dumped in the truck which I have assumed as the case for the 200,000 m3. Hence, calculating the amount of tonnes to be transported needs adjusting for this loosely packed material from the SG. This is called a bulking factor. If one assumes an average factor of 1.2 (20% expansion on excavation) and the load per truck of 30t as indicated and assuming at this SG the truck load is restricted on weight rather than volume the calculation is: 200,000 m3/2.2(t/m3)/1.2(factor)/30(t/truck) = 2525 trucks. This is 48 trucks per week or some 10 trucks per day on a 5 day work week 52 weeks per year if the excavation work is done over a year. Surely these figures can be changed as seen fit, but broad brush this is hardly an impact on traffic. Slides 39 and 40 of the presentation help us put mine traffic in perspective. Slide 39 shows increase of up to 13.8% during construction (this is all traffic, not just the excavated material). The A171 should be more than capable of dealing with that kind of traffic bearing in mind as well that there is 40% contingency build into the forecasts (which is large for transport!). From my experience this road is not very busy during the week (when work at the site is done) but gets quite busy on good weather weekend days (of which we get about 4 per year up here ;-)). SC: one thing to add to your list maybe is what I saw going through town yesterday: one of those new big tractors with two (2) tipper trailers behind it (an agricultural road train ;-). For local disposal this may be an additional and usually cheaper out of harvesting season alternative to typical dump trucks. Well, that is my contribution for this morning ;-). Have a great day.
Yes it is, however it doesn't alter the fact that lorries can only transport upto 30 tonnes net in most circumstances, the volume is irrelevant, as long as 30 tonnes of it will go into it of course.ATB
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