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Thread: tunneling in consolidated aluvium

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  1. #1

    Dec 2015
    83
    36 times
    All Types Of Treasure Hunting

    tunneling in consolidated aluvium

    on leased from state endowment lands and they won't let us touch trees and they said no more vertical cuts, the pay zone is the bottom 8 feet stream laid aluvium . then their is another 8 feet of dirt soil eluvial deposit from the side hill mostly dirt that the trees grow in. local friend whos mined for over 40 years says most of the pay in in the bottom 4 feet especally on the bedrock was thinking I have free suply of 4 x4s 3 foot long and a good bit of 6 foot long 2 by lumber of various widths

    was thinking of tunneling into the base of the gravel and put up roof suports to prevent cave in. would like to dry land dredge and reach in to dig with long tools to stay out side or at least under the protecting timbers so that any minor rock falls at the face I am not under. and then every 6 inch or so go and put in 4 x4 posts with 2 by limber on edge above it.

    spaning 6 feet how deep should the 2 inch planks on edge be? my friend to said the pay layer a is at the bottom does not like the idea of tunneling in aluvium.

    when finished should be able to pump tailing in wet tailings to fill tunnel because first have to dig down 4 feet to get to bed rock, know their is good gold right there but we can't cut the trees even though they are likely 30 years from market size can't just oull the bracing out because being only 2
    12 feet below the surface would cause ground slumping also a no no. thankyou

    ps would prefab the roof beam stacking 4 layers of plank on edge nailed or screwed and glued so it was 6 or 9 inches front to back say a 2x12 then a 2 xy 4 then a 2 by 6 then a 2 by 4 ant for the 6 layer units another 2x4 and finish wuth a 2 by 12 to put them in place one post would be atached then ther other end jacked into place and the second post wedged into position then 45 degree braces could be added in the corners for added stifffening ( ie 4 by 4s cut on both ends at 45 degrees and screwed in place

  2. #2
    us
    Ed Tracy

    Jan 2015
    Shoreline,wa
    Equinox 800
    460
    774 times
    Prospecting
    May I ask how much gold are pulling out per cubic yard dug. ?
    Clay Diggins likes this.

  3. #3
    Charter Member
    us
    papa

    Feb 2017
    Georgetown, SC
    Fisher F75
    2,666
    4476 times
    Metal Detecting
    Get a grip on your gold fever. Sounds like you want to build your own tomb. Your friend is right.


    "And so the population was gradually led into the demoralising temptations of arcades, baths, and sumptuous banquets. The unsuspecting Britons spoke of such novelties as 'civilisation', when in fact they were only a feature of their enslavement." Tacitus, Roman Senator and Historian, written AD 98.

  4. #4

    Dec 2015
    83
    36 times
    All Types Of Treasure Hunting
    Not sure of value but the bed rock is defjnitely the best and do nlt think we have been cleaning it properly friend estimated 18$ yard my guess 25$ but best ever was likely 100 a yard. Again I really don't think we've ever got me very base the Bedrock cleaned right
    Kray Gelder likes this.

  5. #5

    Dec 2015
    83
    36 times
    All Types Of Treasure Hunting
    Not wanting to build my own tune I don't think I have that kind of good luck
    Kray Gelder likes this.

  6. #6
    us
    Jan 2012
    Oregon Coast
    White's V3i, White's MXT, and White's Eagle Spectrum Cleangold sluice & prospectors pan, EZ-Gold Pan, and custom cleanup sluice.
    1,383
    1998 times
    Beach mining, Metal detecting, Trading.
    Tuneling in alluvium......... Not something I would even consider for $20 a yard.... In fact not even for $100 a yard.
    We hold these truths to be self-evident: that all men are created equal; that they are endowed by their Creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness. Thomas Jefferson

    Which is also why we have the second
    amendment.

  7. #7
    us
    Jan 2013
    Cottonwood, CA
    252
    93 times
    Prospecting
    Just thinking of it scares me.
    'Never fear in the dark, that which you believed in the light..."

  8. #8
    Charter Member
    us
    Nov 2010
    The Great Southwest
    3,457
    10024 times
    Prospecting
    Anything less than $125 a yard for subsurface work is a losing proposition.

    You can visit recreational prospecting areas and get better than $25 a yard.

    You clearly don't understand safe tunneling. If you want to throw good money after bad hire a mining engineer, soil engineer etc. and design a plan that's safe. That way you will only lose money rather than your life.

    Heavy Pans

  9. #9

    Mar 2016
    1,560
    2344 times
    All Types Of Treasure Hunting
    Doesn’t sound like it’s worth the effort involved much less the risk.
    Lots of newspaper clips of men being killed in collapses.
    Sometimes it was just a chunk of ground that fell off a vertical face.
    Clay Diggins likes this.
    All treasures found with permission on private property or on active mining claims.

  10. #10
    us
    Mine President, XPBC, GIH

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Rocker boxes, Keene sluices, Bazooka sluice, 2.5", 4" lowbankers, highbankers. Witch Sticks.
    617
    685 times
    Prospecting
    There is literature out there on the subject of tunneling in the stuff, making your sets right and constantly driving in lagging is key to maybe make it out alive. Running a gravel elevator underground sounds like a pain in the ass all the over sized rock still has to be transported out of the drift as well as all the water involved its going to be a royal mess and be prohibitively expensive, at the take per yard you mentioned I don't see you making any beer money. A lot of folks have done it here in California, the richest digs were in the ancient channels under a lava cap and were fairly large operations.
    sidvail and Clay Diggins like this.

  11. #11
    us
    Ed Tracy

    Jan 2015
    Shoreline,wa
    Equinox 800
    460
    774 times
    Prospecting
    The gold fever is strong, we all know it and it makes us do stupid things, back in the mid 1990's I was mining a bank of a the richest river here in western Wa. state. I started mining under a big boulder cemented into the bank ' 5ft X 3ft x 1ft " nice gold as I dug under it, I knew it was dangerous but each day I mined it I said that is it but when I came back the next time I would start back at it again until it happened, I was processing the material threw my sluice when I heard a big thump. Rock down fortunately not on me. Maybe one day I will find a way to move that boulder, lot of gold under it.
    sidvail and Clay Diggins like this.

  12. #12
    us
    Jan 2012
    Oregon Coast
    White's V3i, White's MXT, and White's Eagle Spectrum Cleangold sluice & prospectors pan, EZ-Gold Pan, and custom cleanup sluice.
    1,383
    1998 times
    Beach mining, Metal detecting, Trading.
    I lost a friend in Alaska doing a similar thing.....
    Just not worth it.
    At least not for the amounts you have mentioned.
    We hold these truths to be self-evident: that all men are created equal; that they are endowed by their Creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness. Thomas Jefferson

    Which is also why we have the second
    amendment.

  13. #13

    Dec 2015
    83
    36 times
    All Types Of Treasure Hunting
    thankyou for the advice. proably won't do it good point about the values not being high enough
    et1955 and wildminer like this.

  14. #14
    us
    captain

    Dec 2016
    ohio
    bounty hunter time ranger
    209
    181 times
    All Types Of Treasure Hunting
    We all consider risk and reward but your well being is invaluable .

  15. #15
    us
    Feb 2018
    Western Massachusetts
    49
    64 times
    Prospecting
    If you buy the timber rights, can you cut the trees down and mine conventionally?

 

 
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