Quote: Originally Posted by Tonington
Production-quality oil sands are not found on the surface. Those accessible by surface mining are found about 50 to 75 metres under the surface in large underground deposits. To reach deposits deeper than that, “in situ,” underground-only methods must be used. The deposits in the Athabasca region are known as the McMurray Formation, a Lower Cretaceous oil-bearing quartz sandstone, thought to have formed 130 million years ago. The deposit lies below marine clays of the Clearwater Formation and above Devonian limestone of the Beaverhill Lake Group.Quote has been trimmed, See full post:
To get to the oil sands, mining companies take away all the timber at a mining site, remove the top meter or two of topsoil and clear away the “overburden” — the mix of sand and clay that lies directly atop the oil sands. Then extraction begins.
And, I distinctly remember you and kryptic saying that the soil layers are stockpiled separately. Something about big fines if you mixed soil horizons.
Where do you think they come from? From the bitumen. Emissions come from the upgraders. Just like burning coal proliferates the mercury stored in the coal.
Mining sites arent as big as you think they are,they leave a small footprint when compared to clear cut logging as the mine stays in one place and is contained,production quality bitumen is found on the surface,it doesnt change grade as it gets deeper,if you spent any years in the mine or knew geology you would know this.The outcrop is where they start mining,like any mine for any mineral or what have you,then you follow the deposit down untill the strip ratio makes it too expensive to mine.This is done all over the world in any kind of mine and thats the way it go's.
Your cut and pastes make no sense,your useing deep deposits to compare to the deposits that are mined when they are actually brought to the surface with sagd,which i'm sure you have no knowledge of or your cut n paste guy didnt as it never should be mentioned as far as strip mining is concerned.Maybe you just are that ignorant of mining methods and are useing the cut n paste to make a point but anyone with mine experience reading it would just shake their head wondering what your going on about.Read up on SAGD oilsands production before you post again.
You should also learn what insitu means,your useing the term wrong in your little presentation,it pretty well covers all the oilsands,they didnt migrate from somewhere else.
B.C. probably cuts more forest down in a day then one oilsands operation cuts down in their lifetime.
You have no idea how small an actual pit is,a tailings pond was a pit at one time,maybe 4 square miles in area,it would be mined to follow the deposit at a profitable strip ratio(depends on the price of oil at the time) untill the slopes on all sides of the pit hit natural repose which is the safest grade you can work at and you hit the bottom of the pit which is where the deposit would be smallest or the strip ratio gets higher depending on the geology.This is all planned out before the pit is started which may have been ten years before it was depleted and turned into a tailings pond.You most definetally need a course in strip mining 101 if your going to keep posting what your posting because most of it makes no sense.
There is only one reason and only one why tailings ponds havent been reclaimed very fast and I have been trying to explain it to you but you just dont get it so i'll try one more time.
Mature fine tailings....they are fine clay particles that sit near the bottom of a pond in suspension and will not settle for 40 years,therefore you cant reclaim something that has the consistency of quicksand,thats why we are useing TRO with polymer flocculent which lets them bond back together and settle and release water in 21 days.They settle or dry out,the remaining water can be moved to another pond to be used in the next tailings reduction program and you can start backfilling the pond.
Simple huh?You cant reclaim something you cant even walk on,thats why the floc is added.
Pond 5 at suncor will be gone in maybe 2 years as will be pond 6,trees are allready growing on pond 1.
The remaining water will be transferred to the next one thats on the reclaim list to be recycled and used in the tailings reduction program,you dont take out the water untill all the MFT is gone and you have a stable base.
That's it in a nutshell,very simple technology actually.
As for mercury in coal,hmmmm,that's a new one.Is it as bad as in the lead paint that came with the mini blind's everyone bought from China?