STB south boulder mines ltd

trading halt, page-21

  1. 106 Posts.
    Sorry stb, I know not of the drill holes and can't provide jack as far as info goes on them without seeing the core samples etc, and I don't mean fancy graphs / images, I'd want to physically lay eyes on them as that is about the extent of my experience with them - physical inspection, it was the contract geologists job to do the technical bit, lol.

    The one thing I can say is that being in the type of environment it is in the deposit itself should have very few geotechnical issues (such as thrust faults, grabben blocks, igneous dykes, planar issues etc) and be relatively simple to mine.
    Mind, that is hard to say considering I don't know whether they are going to mine this in a "strip mine" method or in the traditional "open pit" method used in hard rock mining, maybe someone who has seen the ligature of the deposit can tell me whether it lies toward a horizontal inclination or is somewhat dipping like a uranium / gold / copper resource?
    If its flat then it will be easy as to extract, if it's dipping then you simply go for the open pit design and take it that way, both have advantages and disadvantages.
    If its open pit you sometimes need to do a fair bit of pre-split blasting and depending on the MPa strength of the stone you'll need to be fairly on the money with final slope angles so it doesn't collapse, you create a lot of ramps and the amount of catch benches depend on the final pit depth and how much of the resources you are willing to extract - this is dependent on the economics and viability, cut off grade and material costs.
    Advantages of the open pit method are that there is no need for complicated spoil dumps and when you get the ramp system good and correct it needs very little adjustment, and once you tap that resources at depth you can just jam into it with very little interburden blocking the way, ALTHOUGH it can take a while to get there.

    If it is strip mined (think coal mine) then the pros and cons are different, depending on the rate you are going to be taking it out of the ground at and how big the strips (panels on the plan) are you can make wall angles very steep as they don't need to stand up as long, in many cases you can get away with no pre-split blasting at all.
    The cons are waste ore and overburden / inter burden placement, it needs to be progressive and you need to make sure that if you commit to a wall being 90 degrees and know it will only stand for a year, then make sure that in the space of a year you are done there and have shattered it.
    You'd need to be constantly moving burden to get at the product, but the pro here is that if you set it up correctly, and depending on lease size, you can have a few strips going at the same time at varying stages of development and progression.
    Theoretically this means that you have a constant supply of product with very little lead in time and considering the shallow depth it would be easy to manage the waste dump side of things, the "con" to this side in comparison to the open pit method is that once the dirt/stone is gone in that method you just lay into the product - not so here, exposure to it is quicker but it requires more planning.
    I'll take a stab at it and say the water alluvium present in the lease are dried up long ago, meaning you'd be able to angle the hell out of those walls.

    Personally I hope they go a strip mine variant as you can do it with a lot less equipment and get at the product a lot quicker.
    If they strip mine it or similar then if it kicks in 2016, they'd be tapping the roof of the product by later that year if they were to start in January.
 
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