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GB Pro readings on veins of metal?
- Thread starter Hobbyist
- Start date
A "gold vein" isn't a continuous strand of gold weighing thousands of pounds, it's (usually) quartz, with small bits of gold in it here and there. Quartz is nearly neutral on a metal detector, you may hear the change in mineralization but you'll already have seen it with your eyes. In order to get a beep (actually, a "zip"), you need to swing the searchcoil over a piece of gold-- or, if you're not quite that lucky, over a piece of iron or other trash, or over a hot rock.
--Dave J.
--Dave J.
Thanks for the reply Dave. I'm not even daring to think "gold vein" at this early stage, just "metal vein(s)"...trying to keep it real, that's all. Chalcopyrite (a copper-bearing ore) and other hydrothermal deposits can sometimes be found in abundance at those parts. I've picked some up before, no detector needed. Anyway, here's my reason for asking.
Was travelling light with the GB Pro, pan, mini shovel, water n a snack. Came across a patch of granite exposed by a landslide. The granite had fissures n cracks running downhill. Got strong repeatable readings inclusive of a few sweet and crisp zips in all metal mode, max sens along some of the cracks, with Fe3O4 scale varying between 3 and 6 bars.
The frustrating thing was I had no rock hammer or anything to poke into the fissures (and some are really narrow). It's a tough 2 hr walk back to that spot and I've never done any hard rock prospecting before. Looks like I'll have to be carrying a sledgehammer on my next outing.
Was travelling light with the GB Pro, pan, mini shovel, water n a snack. Came across a patch of granite exposed by a landslide. The granite had fissures n cracks running downhill. Got strong repeatable readings inclusive of a few sweet and crisp zips in all metal mode, max sens along some of the cracks, with Fe3O4 scale varying between 3 and 6 bars.
The frustrating thing was I had no rock hammer or anything to poke into the fissures (and some are really narrow). It's a tough 2 hr walk back to that spot and I've never done any hard rock prospecting before. Looks like I'll have to be carrying a sledgehammer on my next outing.
Hey Dave...the 3 to 6 bar readings on the Pro could read that Hobbyist was over a magnetite black sand
crack that could carry assocated placer gold.
Hobbyiest, one question... Do you remember the phase readings while over a crack? A reading around
+- 75 could indicate that the soil type could be one that is known to carry placer gold
crack that could carry assocated placer gold.
Hobbyiest, one question... Do you remember the phase readings while over a crack? A reading around
+- 75 could indicate that the soil type could be one that is known to carry placer gold
Hi Parrot,
Am afraid I can't recall the ground phase. Was preoccupied with the TID and speedometer readings as I flipped between all metal and discrim, and was mainly cussing myself for not bringing even a pocket knife. I've decided to take a friend along next time and we'll be packing sledgehammers, safety goggles, wedges and chisels. Not knowing what's in those cracks is like an itch I can't scratch! Hope that you're right about the possibility of the soil carrying placer gold!
Am afraid I can't recall the ground phase. Was preoccupied with the TID and speedometer readings as I flipped between all metal and discrim, and was mainly cussing myself for not bringing even a pocket knife. I've decided to take a friend along next time and we'll be packing sledgehammers, safety goggles, wedges and chisels. Not knowing what's in those cracks is like an itch I can't scratch! Hope that you're right about the possibility of the soil carrying placer gold!
Hobbyist... Just refererence your manual regarding bargraph and phase readings. Not knowing the metallogenetic
history of your area, it is on my part just a guess. But two or three bars displayed over a narrow spot could
indicate about one precent Magnetic iron (Magnetite, Fe23O4). Magnetite is known to be a constituent of "Back Sand."
A spike of higher bars could mean a [collecter] crevice. In some areas, placer gold and "black sands" aren found
assocoated together especally in volcanic areas. My fingers crossed... Best...js
history of your area, it is on my part just a guess. But two or three bars displayed over a narrow spot could
indicate about one precent Magnetic iron (Magnetite, Fe23O4). Magnetite is known to be a constituent of "Back Sand."
A spike of higher bars could mean a [collecter] crevice. In some areas, placer gold and "black sands" aren found
assocoated together especally in volcanic areas. My fingers crossed... Best...js