nice collection there mate. bit more than 1/2 an ounce awesome . 1 ounce = 31.1034768 grams
I finaly made half an ounce yipee
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xray1982 said:
hi m8 it took me about 4 months to get it all togeather
jethro said:
hi m8 i use borax and butane gas torch because it has a small amount of acetylene in it and burns hotter than just propaine and i melt in just on a big blue stone rock with a grove in it that the gold in melted state falls into it
Hey there HTY
Im suprised that the bluestone rock doesnt spit chips and crack under the heat of the torch.
I found these guys on the net http://www.bullionumis.com/en/16-crucible the price seems reasonable but I havent purchased anything from them as yet. They also sell graphite moulds in various sizes. They have an Australian business address. 20 grams in 4 months is good going. Keep up the good work.
Im suprised that the bluestone rock doesnt spit chips and crack under the heat of the torch.
I found these guys on the net http://www.bullionumis.com/en/16-crucible the price seems reasonable but I havent purchased anything from them as yet. They also sell graphite moulds in various sizes. They have an Australian business address. 20 grams in 4 months is good going. Keep up the good work.
I found some antique crucibles on flebay for $7 that are supposed to have some history from the 1800s lets hope they dont explode
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One heeble (Spelling?) block with a dish carved into it. You can also buy refractory powder that you mix up like plaster of paris it molds just as easy too.
heres the gas i use and the bluestone i melt in on
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Crazy to have two different ounce measurements.. (Troy and a)Just like they used to advertise television in centre metre , and computer screens in inches... That did my head in... Now it's all in inches? Go figure, I swear we had the metric system here. Maybe I've been digging under a rock too long....G0lddigg@ said:
my new crucibles arrived today nothing like using something old plus they'll look awesome next to the other piles of junk in my office
nothing like using something old plus they'll look awesome next to the other piles of junk in my office
Hey there Golddig. Just looking at the pictures of your antique crucibles, I think they may not be crucibles for the melting of gold silver etc, but cupels made out of bone ash for the cupelation part of a fire assay test used to determine the quantity gold in an ore sample.
Nice little relics from a bygone era all the same.
I have a couple of these that I found in a long forgotten processing plant for a mine near Glen Wills after the 03 fires. The fire burnt all the blackberries that choke the gullys up that way & exposed the old crushing plant & cyanide works & assay shed floor.
Jethro
Nice little relics from a bygone era all the same.
I have a couple of these that I found in a long forgotten processing plant for a mine near Glen Wills after the 03 fires. The fire burnt all the blackberries that choke the gullys up that way & exposed the old crushing plant & cyanide works & assay shed floor.
Jethro
hey jethro I think your spot on mate I hit one if them with a bit of hest and it popped like crazy still cool relics for $7
still cool relics for $7
Yes I think they are meant to be heated gently in a muffle furnace. Not with concentrated heat from a torch.
If they are cupels and have been used, they will contain a fair amount of lead oxide and other base metals absorbed into the bone ash. so wash your hands after handling them.
If people are interested I will try and start a thread on fire assay as I have an old book here that describes many of the techniques that were used in the olden days.
If they are cupels and have been used, they will contain a fair amount of lead oxide and other base metals absorbed into the bone ash. so wash your hands after handling them.
If people are interested I will try and start a thread on fire assay as I have an old book here that describes many of the techniques that were used in the olden
days.
thanks for the heads up jethro I just went back and had a good read of the listing details.
"Very Rare Antique Gold Mining Mini Assay Crucibles / Cupels era - 1800's "
I have read that these are possibly made of calcium carbonate also known as bone ash.
They were used to absorb the lead in your bead derived from your melting of your charge in a crucible and this then leaves a precious metal bead that is then weighed to determine ounces per ton"
i'd certainly be interested in reading about old time fire assay methods
"Very Rare Antique Gold Mining Mini Assay Crucibles / Cupels era - 1800's "
I have read that these are possibly made of calcium carbonate also known as bone ash.
They were used to absorb the lead in your bead derived from your melting of your charge in a crucible and this then leaves a precious metal bead that is then weighed to determine ounces per ton"
i'd certainly be interested in reading about old time fire assay methods
me too pleaze
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