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DIY Fire Assay of Gold Ore, Beginning to End | How much gold? 

Orophilia
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I perform a complete fire assay of two gold ore samples, including smelting, cupelling, weighing the gold bead and calculating the fraction of gold. I demonstrate the use of a DIY analytical balance and a home-designed magnifier.
Keywords: gold ore, fire assay, cupel, smelting flux, crucible, gold bead, litharge, weighing gold, gold prill, lead button, magnifier for gold ore

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10 дек 2022

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Комментарии : 70   
@AUMINER1
@AUMINER1 Год назад
Excellent! The instruments you have created are as impressive as the fact that you figured out such a complicated and failure prone process in such a short amount of time. :)
@jdeluisa
@jdeluisa Год назад
I agree, very impressive microbalance. Obviously an engineer.
@surefireKorea
@surefireKorea 10 месяцев назад
Your 3 kW pottery kiln is impressive. You make excellent use of low cost materials in its construction, yet are able to achieve excellent performance and quality. That, in itself, is the mark of an efficient and cost effective design. I learned something useful here. Thanks for your time and effort!
@orophilia
@orophilia 10 месяцев назад
Nice comment, thanks. Kilns are interesting to design and build and much cheaper to make than a commercial model. There are pitfalls, however... -- Dave
@markanderson3740
@markanderson3740 Год назад
I'm so happy to have stumbled onto your channel, It's so refreshing to watch somone besides sreetips follow an actual system they've followed hundreds of times before. your assay was clear, controlled, and conclusive. The ones who constantly add new variables like different flux methods between samples are just untrustworthy. thank you for creating content with confidence.
@MerchantMarineGuy
@MerchantMarineGuy Год назад
This is truest impressive work, and very well taught. Thank you!
@pertinentparadigm1337
@pertinentparadigm1337 Год назад
Wow, you're a genius!
@brixtonnabunat1822
@brixtonnabunat1822 6 месяцев назад
You made fire assaying very easy and simple to do, I'm so glad that i found your channel, new subscriber here! ❤❤❤❤
@ericschultz5413
@ericschultz5413 Год назад
Excellent, straight forward and informative video. Thank you for your hard work in producing it!
@gregbilotta2472
@gregbilotta2472 Год назад
The algorithm has brought me here and I am pleased with its gift
@orophilia
@orophilia Год назад
Haha. Yes, we are all guided by the great algorithm....
@eduardbuletsa9485
@eduardbuletsa9485 10 месяцев назад
Immediate subscription! 👏 Did you see a metallic gold in magnifying glass of this ore after you crash the stones?
@orophilia
@orophilia 10 месяцев назад
I didn't look. Next time I will.
@criscris5061
@criscris5061 Год назад
Increíble
@hieulengotran5093
@hieulengotran5093 Год назад
Money. Workshop. Vietnamese. Asia
@balajiramamoorthy1476
@balajiramamoorthy1476 3 месяца назад
Why you have added iron rod??
@orophilia
@orophilia 3 месяца назад
The iron captures any remaining sulfur and converts it to FeS, which is easily dissolved in and removed by the flux.
@jeffbybee5207
@jeffbybee5207 10 месяцев назад
It seems your cushing and siving would preferentially keep the softest friable part of the sample. Would not this throw off the assay of the ore?
@orophilia
@orophilia 10 месяцев назад
I've wondered the same thing. It must skew the analysis at least a bit. -- Dave
@kerrihansen2413
@kerrihansen2413 Месяц назад
HOW does that last orangish ingredient you add determine the size of the finished button? And is the black glass the melted sand?
@orophilia
@orophilia Месяц назад
Hi Kerri, The orange material is Lead Oxide (Litharge). The charge is 100 grams of ore, 100 grams of Borax, 100 grams of Soda Ash, 100 grams of Chapman's flux from Legend, Inc., 30 grams of Litharge and one iron rod. Bring the charge to 2100 F and soak for 10 minutes.
@aidanwhite6711
@aidanwhite6711 10 месяцев назад
Hello, why cant you use the same furnace for smelting and cupelling?
@orophilia
@orophilia 10 месяцев назад
I could and most people do. The large furnace takes a long time to heat, so I prefer the smaller furnace for cupelling. Why not use the small furnace for smelting? Because I like the larger charge that I can get into the #5 crucible. Good question.
@arotogtech
@arotogtech 10 месяцев назад
Wanted to ask your opinion if it js okay with you. Outcrops grabbed from on top of the reef on the ground surface fire assayed 0.22g/t and 0.19 g/t respectively. What is your general opinion of this?
@orophilia
@orophilia 10 месяцев назад
That would be very low grade and not worth pursuing in my opinion. It does show that the area has gold, so you might want to keep looking. How are you getting the assays done? Good luck with your hunt. -- Dave
@arotogtech
@arotogtech 10 месяцев назад
@@orophilia Hi mate. Thank you for your opinion. We'll, I got them fire assayed. They were grab sample quartz boulders from the top of a certain mountain.
@orophilia
@orophilia 10 месяцев назад
@@arotogtech Look for the highly mineralized quartz veins and take samples directly from the vein. Can I ask how much you paid for the assay? -- Dave
@arotogtech
@arotogtech 10 месяцев назад
@@orophilia The question is, how do you look for the highly mineralised quartz vein? I just dowsed using copper rods...... do you have any other methods......? You could share a few tips...... I paid $25 each.....
@orophilia
@orophilia 10 месяцев назад
@@arotogtech The quartz should have lots of inclusions of brown / purple / black material. The more ugly and rusty the better. -- Dave
@johnsabatka2978
@johnsabatka2978 Год назад
Where did you get that classifier?
@orophilia
@orophilia Год назад
From Amazon. It's a cake flour sieve: www.amazon.com/gp/product/B07ZRJFYH1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
@ashotarzumanyan9958
@ashotarzumanyan9958 18 дней назад
How many celsius does you heater Heat ? Thanks
@orophilia
@orophilia 17 дней назад
The pottery kiln can get up to 1200C
@jdeluisa
@jdeluisa Год назад
Interesting vid. I enjoy your videos. I find it interesting that you use Chapman's flux for assay work. Any thoughts on that? In his book, Chapman suggests that Mg Dioxide can cause silver values to report to the slag. It also seems like more litharge could be beneficial when assaying 100 g of material. One assayer that I have worked with uses significantly more litharge, even in smaller samples. Others have suggested this to me as well. Finally, why not part and weigh? The math calculations may not account for other values like PGM's.
@orophilia
@orophilia Год назад
You are correct on all accounts. I'm trying to part the gold beads right now. It's another step that needs to be mastered. I'll soon have exhausted my supply of Chapman's. At that point I'll move to just Borax and Sodium Carbonate as the flux. More Litharge requires larger cupels. I've been running some experiments on that aspect and I'll report in a later video. Thanks!
@jothimurugan2319
@jothimurugan2319 9 дней назад
Sir What is the name of the rock you have assayed ?
@orophilia
@orophilia 8 дней назад
It is from a quartz vein.
@soso.123m4
@soso.123m4 Год назад
Which size have these mabor cupels?
@orophilia
@orophilia Год назад
The one that can absorb 35 grams of lead.
@TerribleShmeltingAccident
@TerribleShmeltingAccident 9 месяцев назад
actual flower? like the kind you use to bake bread?
@orophilia
@orophilia 9 месяцев назад
Yeah, we just need a handy source of carbon.
@TerribleShmeltingAccident
@TerribleShmeltingAccident 9 месяцев назад
@@orophilia how does the carbon affect the reaction?
@orophilia
@orophilia 9 месяцев назад
@@TerribleShmeltingAccident The carbon acts as a reducing agent. The lead, in the form of PbO, is reduced to metallic lead by reduction. -- Dave
@user-ls7xj8gs6q
@user-ls7xj8gs6q Год назад
لكن هل يمكن تركيز الذهب عبر الغسل لهذا الخام ، أو ان الذهب سيهدر مع الغسل
@orophilia
@orophilia Год назад
"But is it possible to concentrate the gold by washing this ore, or will the gold be wasted during the washing?" Yes, in practice we would first concentrate the gold in the ore by fine grinding and then performing some sort of gravity separation. Good question, thanks. -- Dave
@user-ls7xj8gs6q
@user-ls7xj8gs6q Год назад
@@orophilia thank you
@user-ls7xj8gs6q
@user-ls7xj8gs6q Год назад
@@orophilia thank you
@yuhangqian6991
@yuhangqian6991 Год назад
Where is the cupel produced,India or China?
@orophilia
@orophilia Год назад
I use Mabor cupels. I'm not able to determine the country of origin. -- Dave
@yuhangqian6991
@yuhangqian6991 Год назад
@@orophilia Mabor cupel is produced from India.
@orophilia
@orophilia Год назад
@@yuhangqian6991 Thanks!
@user-oz7sv8er4c
@user-oz7sv8er4c Год назад
Good morning 🌄 my 🙏
@SURFEAMORETERNO
@SURFEAMORETERNO Год назад
If the ore also contains some silver,where is it?
@orophilia
@orophilia Год назад
The silver is also in the bead but in very small quantities. I try to explain the way I measure it at the end of the video but it might not be so clear. -- Dave
@SURFEAMORETERNO
@SURFEAMORETERNO Год назад
Thanks for the answer. Be cautious of fumes. I recently placed an ore of the Platinum group to dissolve in aqua regia, and was surprised to find Osmium, whose salts are extremely toxic. Luckily I used a fume hood with a filter and handled small amounts. My equipment is also "Frankestein's" A hug!
@orophilia
@orophilia Год назад
@@SURFEAMORETERNO Yeah, thanks. I always use a good respirator. Very interesting to find Osmium! -- Dave
@SURFEAMORETERNO
@SURFEAMORETERNO Год назад
Interesting but too complicated to separate the Platinum group metals to be able to refine, especially when Osmium Iridium and Ruthenium are present. It takes special facilities, sophisticated equipment and a lot of knowledge. You believe that Platinum Chloride is toxic until the day you put the whole gang in solution. Things get really violent. A hug!.
@orophilia
@orophilia Год назад
@@SURFEAMORETERNO The world is a beautiful, interesting and complicated place. Un abrazo. -- Dave
@hieulengotran5093
@hieulengotran5093 Год назад
No. Không ráp. Không chế tạo. Bảng in. Money ( ít số 0 : 500.000 vnđ. 100 dollar. 1 cm ( euro ). No. World. Science
@aliosmankucukpacalar
@aliosmankucukpacalar Год назад
Turksh translate plz
@hieulengotran5093
@hieulengotran5093 Год назад
Money. Who
@myadventure7069
@myadventure7069 Год назад
I sometimes thinking why people getting gold expensive way possible
@orophilia
@orophilia Год назад
This just an assay, but yes, it's a very expensive way to get a couple of milligrams. On the other hand, it's one great hobby! Thanks for the comment. -- Dave
@myadventure7069
@myadventure7069 Год назад
I using chemicals to recover gold
@hieulengotran5093
@hieulengotran5093 Год назад
Carve. Khắc. Thêm 144 số 0 : bảng in. Money. Science. World. Workshop. Company. Vietnamese. Asia. Cr. Khuôn. Cu : who. Plane. Wifi
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