How to break rocks underwater
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  1. #1
    You can't outlaw nature.

    Jul 2014
    Northern CA
    41
    73 times
    Prospecting

    Question How to break rocks underwater

    Morning,

    Last summer I found a honey hole while sniping. There was a 'V' shape that the side of the river ran through and I was able to pull out a few grams of gold while digging down into this 'V' formation in the bed rock. As I dug down I found a 3ft wide x 2ft long x approx 8" thick rock that is blocking the center of the 'V' (thats what she said). I had a 4ft pry bar but was unable to move the rock. The location makes it particularly difficult to get to since I have to dive down about 4ft to get to the area to work. This summer I'll bring a come along down with a strap to see if I can break it loose.

    Do you guys have any recommendations on how to break larger rocks underwater?

  2. #2

    Aug 2015
    Northeastern Sierra's
    689
    1319 times
    All Types Of Treasure Hunting
    Best bet IMO is to use an old tire chain and a winch. You can get old chains on any highway where the snow flies. Seems some truckers can't put them on right. A come along may not have the strength to move larger rocks. Dig around your boulder as best you can, then give it a yank. It may dislodge and you'll be able to pull it out of your way.
    RTR, ratled, DizzyDigger and 1 others like this.

  3. #3
    us
    Jul 2004
    Angels Camp,Ca.
    819
    819 times
    Use a single jack and a gad or moil on one edge...or if you just want to move it try to lift one edge a bit and keep adding smaller rocks underneath.Not much fun getting pinned under a big slab as happened to me in the late 1970's.A weight belt will make you less buoyant.
    Clay Diggins likes this.

  4. #4

    Feb 2014
    903
    2292 times
    All Types Of Treasure Hunting
    "Best bet IMO is to use an old tire chain and a winch. You can get old chains on any highway where the snow flies. Seems some truckers can't put them on right. A come along may not have the strength to move larger rocks. Dig around your boulder as best you can, then give it a yank. It may dislodge and you'll be able to pull it out of your way."

    +1 on mechanical advantage. A rock that small could be moved with a come a long and maybe even a 5' bar.


    Never confuse motion with progress


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  5. #5
    Charter Member
    us
    Look at the Historical Gold Mining photo albums on my page

    Jan 2013
    Huntington, Or./ Stanton, AZ/ former Outlaw California Gold Dredger
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    Sounds pretty small from your dimensions but still, you can easily drill and blast any size rock out of your way. An underwater battery powered sds plus and one charge with a sierra blaster is simple.
    Clay Diggins and russau like this.

  6. #6
    us
    Jun 2013
    El Dorado County
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    Drill and winch.
    Quote Originally Posted by GoldDoozah View Post
    The fact that homo sapiens teach genetically engineered canines tricks, on the third planet of this particular star in the Milky Way, is extremely unlikely.

  7. #7
    You can't outlaw nature.

    Jul 2014
    Northern CA
    41
    73 times
    Prospecting
    Quote Originally Posted by Reed Lukens View Post
    Sounds pretty small from your dimensions but still, you can easily drill and blast any size rock out of your way. An underwater battery powered sds plus and one charge with a sierra blaster is simple.
    I was unable to break it loose with a 4ft breaker bar and 3lb sledge. What is an SDS?

  8. #8
    You can't outlaw nature.

    Jul 2014
    Northern CA
    41
    73 times
    Prospecting
    Quote Originally Posted by mytimetoshine View Post
    Drill and winch.
    Under water drill? Link?

  9. #9
    Charter Member
    us
    Nov 2018
    Portage, MI
    Bounty Hunter TR550-D
    23
    26 times
    RF Design
    SDS refers to the drill bit end fits into an SDS chuck I am guessing.

    Underwater drill on ebay shows Nemo Power tools to 164 feet starting at $800 or so.

    I might buy an SDS chuck, a harbor freight pneumatic drill (consider it a throw away) and haul in a gas powered air compressor, might be cheaper, depends on how easy the site is to get to.

    Sounds like fun.

  10. #10
    Charter Member
    us
    Aug 2017
    Northern Virginia
    AT MAX/AT PRO/GPX-4500,Garrett Pro Pointer,NEL Attack Coil, Lesche diggers, and the custom made in the USA Freeloader Pack Mule Pouch!
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    Honorable Mentions (1)
    Are explosives out of the question?

  11. #11
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
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    Just thinking out of the box here.....might you be able to fit a small hydraulic jack under the rock? A few strokes may loosen it up enough so you can move it out of your way.

    Good luck.
    Last edited by arizau; Jan 28, 2020 at 04:01 PM.
    If it can't be grown, it must be mined!

  12. #12
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
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    Quote Originally Posted by BLK HOLE View Post
    Are explosives out of the question?
    It is probably a trout stream so yes. On the other hand......be sure and set a seine down stream to collect all the fish.
    Last edited by arizau; Jan 28, 2020 at 03:58 PM.
    If it can't be grown, it must be mined!

  13. #13
    Charter Member
    us
    Look at the Historical Gold Mining photo albums on my page

    Jan 2013
    Huntington, Or./ Stanton, AZ/ former Outlaw California Gold Dredger
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    russau likes this.

  14. #14
    Charter Member
    us
    Look at the Historical Gold Mining photo albums on my page

    Jan 2013
    Huntington, Or./ Stanton, AZ/ former Outlaw California Gold Dredger
    Tesoro Vaquero, Whites MXT, Vsat, GMT, 5900Di Pro, Minelab GPX 5000, GPXtreme, 2200SD, Excalibur 1000!
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    The Sierra Blaster is made in Oroville, you should call them.
    russau likes this.

  15. #15
    us
    Mine President, XPBC, XGIH, GDR, stamp mill operator, snuffer bottle owner/operator.

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
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    Reed you can run a sierra blaster underwater?

 

 
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