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Offline ArfieBoyTopic starter
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« on: August 30, 2011, 10:23:50 pm »
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Does anyone have any idea what these are?  I found them near an abandoned stamp mill many years ago, and I still haven't figured out what they are.  They are made of steel, about 6 inches high and weigh around 20lbs. to 25 lbs.  The largest is about 6 inches across the top and the smallest is 4 1/4 inches across.  The coffee cup is a 16 oz. cup, to give a perspective of size.

Any ideas anyone?  Huh?

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« Last Edit: August 30, 2011, 10:25:30 pm by ArfieBoy » 		Logged
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« Reply #1 on: August 30, 2011, 10:29:43 pm »
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I'm thinking what you have there is the replaceable Bottom half of the stamp mill.

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Offline ArfieBoyTopic starter
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« Reply #2 on: August 30, 2011, 10:34:51 pm »
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Thanks homefire!  That is a possibility I hadn't considered!  They look like they were poured into molds, then where the tops overflowed the molds they were chipped off or broken off.  At least on the three biggest ones.  The little one doesn't look like it overflowed at all.

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Offline GoldDigger1950
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« Reply #3 on: September 14, 2011, 03:15:06 pm »
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They are slugs from assay crucibles that were used to test the crucibles for cracks and trapped moisture. If either were present, the crucible would fail spectacularly spreading molten gold in an explosive mess everywhere. Steel was cheaper to use for testing before pouring the crushed ore into the assay cups for smelting.

They way they work is that the ore is crushed and sampled into the assay cups. Then, smelting allows the gold to collect at the bottom of the cup and the gold slug is weighed and the percentage of gold in the ore mix gives the yield per ton. Any moisture or cracks in the assay cup which was made from ceramic would result in a disastrous, although small, explosion inside of the furnace. All gold would be lost until the furnace was shut down and cleaned. Several samples a day allowed for the mine to estimate the dollar yield as well as the yield per ton.

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« Last Edit: September 14, 2011, 03:16:49 pm by GoldDigger1950 » 		Logged
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Offline avision4u2liveby
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« Reply #4 on: September 14, 2011, 03:20:39 pm »
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sounds like you better get yer butt back over there! I doubt they spilled gold all over the place, but those are some really cool relics to keep a few and sell the rest  Cool I bet you had fun lugging those around to get to the truck!  I usually make piles of heavy stuff like that and then forget it, or dont want to lug it! Good thing you kept them, thats a very interesting find!  Rider

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Offline ArfieBoyTopic starter
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« Reply #5 on: September 14, 2011, 06:25:02 pm »
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Thanks GD for the information.  Would the large crucibles like that be the ones they poured the gold sponge into before melting them into bars for shipment to the mints?


Vision, the mill was up on the hillside above the truck, so it wasn't too bad carrying them downhill!

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Offline GoldDigger1950
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« Reply #6 on: September 14, 2011, 08:09:48 pm »
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Not really because large quantities of raw ore are processed more economically than smelting. This kind of process is for use at the mine site near the stamping heads. Truckloads of ore are processed using a variety of means depending on the yield and the type of aggregate in the matrix.

Posted on: September 15, 2011, 04:08:14 AM
Quote:Posted by ArfieBoy
Thanks GD for the information.  Would the large crucibles like that be the ones they poured the gold sponge into before melting them into bars for shipment to the mints?

The larger the sample, the more accurate the assay. In the grand scheme of things, there is a practical limit to the size.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline ArfieBoyTopic starter
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« Reply #7 on: September 14, 2011, 09:48:12 pm »
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Okay, GD.  Thanks forall the extra information.  I really appreciate it!   Detecting

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