*Reads title *looks at old computer Old computer: heavy sweating

@Local_Felix

4 жыл бұрын

Haha

@projectretro8243

3 жыл бұрын

Haha

@professor6947

3 жыл бұрын

nice one 👍

@danblu2346

3 жыл бұрын

* softly* Dont

@raggednerf4139

3 жыл бұрын

Lol

1 - buy expensive chemicals 2 - extract a blank amount of gold 3 - realize you lost money 4 - make a youtube video to try to recover money with adsense

@mmcad0a951

4 жыл бұрын

Step 5: Profit

@guradamuretos9863

4 жыл бұрын

Step 6 : *STONKS*

@zenoctis196

4 жыл бұрын

Step 10 - break out of prison then *repeat*

@williampankratz600

4 жыл бұрын

I did notice an add for a collage degree,,,,,,,,,,,

@Glu-R

4 жыл бұрын

step 12 - hold my beer

Actually Old CPUs can be more worth more than the extracted gold itself, the retro computer community does pay really well

@the_mariocrafter

2 жыл бұрын

Yep. I am an enthusiast and I would pay

@zoompt-lm5xw

2 жыл бұрын

CPUS pre 2008 are worth their weight in gold Probably more

@derekpaul907

2 жыл бұрын

True, but gold is easier to sell.

@MalhaIIa

2 жыл бұрын

and here i am about to throw away a lot of working scraps. 3 old computers and a laptop + spare parts. ddr1-ddr2 range. if i put them up for sale it wouldn't sell, unless i basically give it away for free. got some stuff from mid 90s. however a pentium 3 i threw years ago. i tend to save the ram and hdd's, unfortunately i dont think there's much in a hdd besides a little on the controller. edit: hmm. i have a working C64, even a printer to it.

@derkevevin

2 жыл бұрын

@@zoompt-lm5xw that sounds interesting because i have a 2005 pentium 4 630 in original packaging sitting here, but ebay says 2 dollars 😅

Your instructions were unclear, I ended up doing methamphetamine

@raphaelmad3485

4 жыл бұрын

Porro lol

@Brennanrr

4 жыл бұрын

Yeah that’ll get you happened to my dad too

@canadiancop3967

4 жыл бұрын

Hey, that's illegal...

@syntax6029

4 жыл бұрын

Do you realize that it says "Part 1"?

@kevinmiller2210

3 жыл бұрын

Lul

I like how he can say “ I didn’t have any cyanide” and it’s normal

@Chillerll

4 жыл бұрын

did you know you can make that stuff with apple seeds?

@jojowinters7138

4 жыл бұрын

Felix C yes I did that’s why dogs cannot have them

@eva-lota9701

3 жыл бұрын

Well, you just run out of the stuff sometimes.

@johnarooskivlogs9818

3 жыл бұрын

Felix C and cherry pits

@TheBurnknight

3 жыл бұрын

@@Chillerll yes. just have him buy like 50 apples just to remove the seeds and extract the microscopic amount there is.

Try with antique computers. The gold plating is usually thicker tho. Like a lot

@americanengineering2063

5 жыл бұрын

also most of the gold is in the cpu's. pentium 1 and pentium 2 have approximately 1-2g

@thestarskynight3291

5 жыл бұрын

Extra *THICC*

@heritagekebek9979

5 жыл бұрын

@@americanengineering2063 Pentium Pro ;) 1994/1995. Best gold amount.

@smithy1578

4 жыл бұрын

I’m currently harvesting gold from an old computer 1998

@kennysboat4432

4 жыл бұрын

@@smithy1578 If it still works, or parts of it still work, sell the computer online instead of scraping it. you can make 3-4x as much.

Wife: Honey have you seen any of my laptops? Husband: Forget about your laptops. I got you a gold ring. Happy anniversary!

@maticsss

3 жыл бұрын

all fun and games until his mission is: Survive.

@annee547

2 жыл бұрын

@@maticsss Mission failed, we'll try again next time.

@ThisHandleFeatureIsStupid

2 жыл бұрын

Ha! I got a solid chuckle out of this. Thanks, buddy! 👍

@InertiaCreeps

2 жыл бұрын

Sweetie I had to wreck that Honda…. I mean those laptops. And don’t worry about Zed. Zed’s dead baby, Zed’s dead.

@Nyatsimba_Mutota

2 жыл бұрын

😂😂 u crazy man!

"I didn't have any cyanide" Boy, I can relate.

@randomanimations1621

3 жыл бұрын

I did this and do you know what I made golden cyanide

@ok1025

3 жыл бұрын

@@randomanimations1621 goldide

@randomanimations1621

3 жыл бұрын

@@ok1025 exactly

@realipadgaming109

3 жыл бұрын

@@randomanimations1621 mp

@realipadgaming109

3 жыл бұрын

l

shout out to the ant at 6:52 i hope you're living a good life

@335d-Lane

4 жыл бұрын

That ant is dead now.

@Cam_23554

4 жыл бұрын

Along with my will to live

@vapecat4428

4 жыл бұрын

Whoa... Can you marry me?

@Cam_23554

4 жыл бұрын

Who are you talking to?

@335d-Lane

4 жыл бұрын

boil space is fake as hell and the government is spraying hormones on our babies.

Summary of gold recovering business: 1. Add acid 2. stir 3. filter 4. repeat and repeat 5. Realizing it's not making money.

@JonitoFischer

5 жыл бұрын

Then you realize you need shithole country slave workers...

@misterfister6096

5 жыл бұрын

Had my yacht already ordered... D'oh

@jasongts

4 жыл бұрын

realizing it’s not making money? *visual frustration*

@manda3dprojects966

4 жыл бұрын

Realizing it's more expensive than gold.

@phamdinhhoang1998

4 жыл бұрын

Good luck trying to sell those gold

I usually put the aqua regia beaker into a warm water bath to speed up the reaction. I use urea (which is very cheap) to bring up the pH, and then precipitate with warmed metabisulfite solution. Warming the neutralized gold chloride and metabisulfite, I found, caused almost instantaneous precipitation of all the gold into a sponge-form, which is then very easy to recover.

can we all agree that Nigel’s voice is very soothing and makes you feel good

@randomanimations1621

3 жыл бұрын

Wow I feel good I knew that I would now so good so good

@prestonspencer6094

3 жыл бұрын

His voice ain't got nothing on Lock Picking Lawyer lol. Guy has the voice of an angel

@mikehawk1673

3 жыл бұрын

@@prestonspencer6094 you obviously don’t know about Ed Bolian from VINwiki

@prestonspencer6094

3 жыл бұрын

@@mikehawk1673 man but still though lol lock picking lawyer got the voice of an angel 😂😂

@W-I463

2 жыл бұрын

You're the first person i've heard say that. I don't think most the viewers are here for his voice

Made a twitter! twitter.com/NileRed2

@pinksapphire2898

7 жыл бұрын

can you do a video on how to recover palladium from MLCC's?

@meri5731

7 жыл бұрын

u could have just scrap off the gold from the computer part or carefully heat to separate the gold that was put on that computer part. why wait 2 weeks and use so much materials and ruin all other computer parts to get the gold off and polluting environment with so many chemicals ??

@caughtspeechless3288

7 жыл бұрын

meri You seem very uninformed. I'd recommend doing even slight research on what you're talking about, but you probably wouldn't listen.

@Salmanul_

6 жыл бұрын

YOU MADE TWITTER?

@rohitchandrahas

6 жыл бұрын

Hey man great videos . Love your work. So I did the gold extraction as a project for an assignment at school. Followed almost all the steps you did except I used HNO3 to get rid of all the base metals.Then I dissolved the gold obtained in aqua regia .To precipitate it I'd used Sodium MetaBisulphite. On adding the first few spoons, there were tiny black clouds formed, But after that nothing much seemed to be happening even after adding more metabisulphite. I've a hunch that i used a tadtoo much of Aqua regia. Even after 2 hours there was no sign of any precipitation. Did I do something wrong like adding excess of metabisulphite or would i have to wait longer? Around 0.25g of gold is expected to be there. And i used mainly ram and data card trimmings. So what do you suggest I do?

these videos are very soothing and good before bed

@UltimatelyEverything

4 жыл бұрын

Nile's videos are better than porn

@danielebonadeo1816

4 жыл бұрын

I've been using them to treat my insomnia

@Alleycat041

3 жыл бұрын

I listen to them to help sleep

@daniellestewart4646

3 жыл бұрын

This guy must really like his coffee filters.

@d.plaguethedocter8542

3 жыл бұрын

I have been using them to make a wooden rifle out of a stop sign and 2 Macintosh computers.

0:58 we're not breaking even we're breaking bad

1) The green color is copper, silver and small amounts of platinum metals 2) The Aqua Regia and acid amounts DO affect the resulting recovery efficiency. 3) Grinding or burning the boards means that step 1 takes a day or 2 instead of a week.

many computer repair places will just give you pcb's if you ask. they tend to have a ton and dont recycle them on their own.

@noahcarlton4625

5 жыл бұрын

Really, I'll have to remember that

@EvolvedApe

4 жыл бұрын

Yep, I fill a 40ft shipping container every year.

@aquilatempestate9527

4 жыл бұрын

@@EvolvedApe That's interesting. What do you do with the container? I have a business already but always interested in different business models and how they function.

@EvolvedApe

4 жыл бұрын

@@aquilatempestate9527 Last year, a guy bought it all for $8000, container included. Don't have a buyer this year. Apparently the Korean guy I sold to last year retired and moved to the Philippines.

@aquilatempestate9527

4 жыл бұрын

@@EvolvedApe Thanks for the response chap. Was he selling it in Asia?

Funny thing, I actually worked at the factory that these exact PCBs. Those are actually test coupons. I can tell by the silkscreen code on the coupons.

@blairsalk878

5 жыл бұрын

Pa

@justinhamilton8647

3 жыл бұрын

Yeah right. And I dated Bill Skarsgard in college.

i like how the disclaimer at the beginning says not to try this but he also gives us exact directions and amounts of everything as if we were going to do it

You can also use dilute nitric acid for the initial cleaning of the boards. Weak nitric acid easily removes copper and nickel, but won't touch gold, platinum, palladium, or rhodium at all. It will dissolve silver, but so does HCl and peroxide.

A lot of times computer scrap will contain lead. I noticed you did not add sulfuric to drop out lead before adding SMB to your solution. Hopefully these PCB's were lead free, or your gold is going to be contaminated. I have been watching sreetips channel. That guy has been doing this a long time, and seems to have perfected every method. I also love watching Cody'sLab (who I see also commented here), but sreetips is the one i always tend to go back to when I have any questions. But I love your's and Cody's channels because you guys are actually chemists, and describe the actual chemical processes that are happening. Keep up the awesome work. I love how you can actually learn things on KZread and it is not all just stupidity, conspiracy theories, and bickering. You guys who are hear to teach the world, are what make KZread great, in my opinion.

@petermichaelgreen

6 жыл бұрын

The boards in the video look like boards that were scrapped before ever being assembled.

@Kero7th

3 жыл бұрын

Here

@kokoslegend4850

3 жыл бұрын

There is always lead in computer chips. The soldering iron contains lead.

@frankrodgers7524

3 жыл бұрын

@@kokoslegend4850 Actually it's tin, not lead.

@kokoslegend4850

3 жыл бұрын

@@frankrodgers7524 it is in most cases made from a mixture of lead and tin. However, there are lead free variants.

I'm in the middle of recovering gold from a variety of junk I've had sitting around for ages. Dead computer/phone parts, gold-plated connectors, and unassembled prototype PCBs. I'm using hydrogen peroxide and vinegar, which is working great for how simple it is. It only really dissolves copper, but that'll get gold off of PCBs and some contacts. Pretty sure I spent *way* more time than it's worth recovering this stuff. Really, I only have _maybe_ half a gram here if I'm being optimistic. But hey, I'm having fun and getting an excuse to buy cool glassware.

*FBI questions why you need cyanide, what is your response?:* "I"m devolving gold from computer parts."

@ALCRAN2010

4 жыл бұрын

FBI: ...from tooth fillings ya mean?

@turtle7792

3 жыл бұрын

*dissolving

@Payday5

3 жыл бұрын

Sorry- devolving?

@MadScientist267

2 жыл бұрын

Lol not really an issue

This is luxury thing :diamond :gold :gold solution

+NileRed very nice video

@Rafi-hb9eu

6 жыл бұрын

indeedItdoes

@internationalspacestation1988

4 жыл бұрын

ok

@flup1303

4 жыл бұрын

Roarke Barrett ok

@LumiOfFrost

4 жыл бұрын

Roarke Barrett O k t h e n

@Kayshots

3 жыл бұрын

Nileblue Nilered Nilegreen

whos with me for a colab of Nile red and Cody slab🙆

@NileRed

7 жыл бұрын

That would be awesome! It will probably happen one day

@blzahz7633

6 жыл бұрын

No, they should be roomies. Or at least share a lab. Who knows what they could do for humanity, when they combine their powers.

@viktorjangsell1849

5 жыл бұрын

One problem tho, one lives in Canada and the other lives in Utah of America

@deelee6786

5 жыл бұрын

nile red is much more professional ;P

@galenhutcherson6140

5 жыл бұрын

I love Cody slab lol

my old calculators from middle school served me well, now it's time to use one to calculate how much gold I could get from them edit: I got about 44 Canadian dollars

@Green24152

2 жыл бұрын

Nice one.

@jafargames1196

2 жыл бұрын

Nice

@quickdrawmcgraw3567

2 жыл бұрын

Nice.

I would love to see you redo this with different computer parts or materials and a few more years experience to see how it affects your yield/profit. Extracting precious material from junk is so cool to me, even if it's not technically worth it.

Processors with pins are a great source, FYI.

@RandomHandle837

3 жыл бұрын

@@Jasperr9999 at least it’s quite an easy process, only time when that’s great

13:33 ... Black Gold. Texas Tea. Oil, that is.

Instructions unclear, my stomach is now plated in computer parts

it's 2 am in the morning and I have 3 more assignments to complete then now I'm learning to extract Gold from old tech parts. Great!

wanted something I could try, ended up in a chemistry class :). thanks man

@RyanSmith-wo2pi

4 жыл бұрын

.. . .

It seems like even if you know exactly what parts to buy, that when you take into account the cost of materials, the time hunting down the right deals, and the time put in to the actual recovery, that the profit per hour would be less than a minimum wage job.

@MonsterPumpkin

2 жыл бұрын

Unless you scavenge the parts themselves for free by scavenging them from trash cans or electronics disposal boxes, for example I salvage the computer parts I find from the electronic disposal box in front of the IT department at school, long as you wait till you have enough computer scrap to net you a profit in return of gold per refinement process you should be good, but obv it won't give you as much money as a minimum wage job, it is more of a side income no matter what

@bradhaines3142

Жыл бұрын

@@MonsterPumpkin time involved scavaging would likely make it worse than the awful money you'd get anyway

I’d like to see a video on how to extract gold from old dental crowns that were removed by my dentist. And no, I didn’t let the dentist keep them! I think this would be a much different process (as it’s big chunks mixed with other metals, and not gold plated).

@wonderbars36

2 жыл бұрын

Dude I was wondering this with PCBs (work for a CM). Some of them are able to solder WAY better than others even though all get gold plating and, to the eye, look identical from one array to another. I suspect crappy gold mixed with other junk in your case as well as mine.

This is why these companies be holding these computer recycling events.

0:58 I know you already did by uploading this video 😁 This channel is a treasure, worth more than gold

This guy must really like his coffee filters.

Aquarium pumps are meant to have a bubbler stone at the output end of the tube. That disperses the air coming through the hose into hundreds of tiny streams of air making incredibly small bubbles.

0:29 gamer juice

Very familiar with this process, very nice first try. I use the same process to recover gold from slag (I process small amounts of other metals from other ores). My first few attempts weren't very efficient to say the least :)

"Little bit of chemical treatment" *explains the process in 3 videos*

@J.J_18

4 жыл бұрын

🤣

I love the bug photo bomb at 6:50 lmao 😂

You said "Sodium Metabisulfite" at 2:56 but it shows "Potassium Metabisulfite"on the label.

I tried to start a business like this, because I had access to a lot of junk electronics in my job just after high school. I talked to my high school chemistry teacher to try to get some help but she didn't trust me lol

I like it when he says "Gold."

@GiGitteru

4 жыл бұрын

@@gavindao6754 Ayy Twoset

I love you Nile!

"I moved the gold to the front so you could really see what was going on in this step" *pop up ad immediately covers the front of the beaker*

The mason jar says potassium metabisulfite while you said sodium metabisulfite.

@NileRed

8 жыл бұрын

+Ryan Tooher (FantomZap) wow i have no idea how i did that. Nice catch though. It actually is potassium metabisulfite. I messed up, but in the end it doesnt really matter. Both work equally as well

@FantomZap

8 жыл бұрын

+NileRed lol, its all good.

0:00 "Wow I'm rich." 14:20 "Oh, forget it."

KZread finally recommends this after 3 years

Fun fact - The chemicals he used costed more than the gold extracted itself!

@moobloom155

3 жыл бұрын

F

this is how people get gold in the future, nile is way ahead of his time.

@rainalane1638

5 жыл бұрын

Ray well, u can get cancer and various diseases and body functions disorders from doing this in long term

@deadbush2812

5 жыл бұрын

you know the people who make this need the gold to inject it into the computer scrap, right?

@art_and_sh.t4265

5 жыл бұрын

Nah they'll probably make it in labs

@saddog8087

5 жыл бұрын

Does he wear suits or does he just wear gloves

@BirdTurdMemes

4 жыл бұрын

Nah, gold will be worthless because of asteroid mining

My Old Windows: uh oh.... My Broken Laptop: oh shit... Me: *slowly putting on Gloves*

@BeefCurtains42069

4 жыл бұрын

Hahahahahah

@leawilson5177

3 жыл бұрын

Robotsnake20's Broken Laptop After seeing Robotsnake20 put's gloves on: aw fuck...

Some PCBs are have whole-board ENIG, which means stripping the solder resist with strong base might expose more copper pour and help recover more gold.

He is the only person to ever say I’m fresh out of Cyanide 😂😂

Me :"watching the video" My computer : Oh man i'm dead...

Can you make a video on extracting silver from film

This must be the Gold Experience!

6:52 A bug runnin! Those were your good ol days!

I love your videos, they help me when I have trouble sleeping

@PHlophe

4 жыл бұрын

weirdo !

Processors, RAM, and anything with a PCI-E bus aren't bad choices. Connectors (processor pins, RAM buses, PCI-E buses) are what are most commonly gold-plated because gold being soft and conductive confers desirable properties when plating connectors.

Hey Nile, I love watching your channels even though I don't understand most it. Anyways, could you do a video on extracting platinum from dirt you get from highways?

“I’m personally not even close to a master at gold recovery” is such an Alpha statement I can’t explain why

I like how he sounds surprised that he doesn't have cyanide on hand.

POV: You are getting this video recommended 5 years.

@DzakiPedia

3 жыл бұрын

True.

@tba3625

3 жыл бұрын

!true

omfg that filter adjustment at 8:10 was heaven! 😍 I was *immediately* annoyed by the way it crumpled, and then you immediately rescued my rapidly-deteriorating emotional state by fixing it. Thanks, man. I was only a few seconds away from losing my shit there. lol

@abdullahmehmood8342

2 жыл бұрын

that's called fluted filter paper folding in chemistry

Hey... You've saved a life today, and I want you to know that i'm very grateful for you. I love you and please keep going.

Never destroy a working older part. Plenty of people looking to build retro gaming rigs out there. That old 80486 or Pentium chip is likely worth far more to a collector / gamer than as scrap. Even bent or missing pint can be fixed on really old chips. More modern chips like the P4 on up are much harder to fix once broken. But an early Pentium or 386/486 can be easily fixed.

6:52 aww how sweet. You brought on a guest :-)

He sounds no older or younger than today. His video as a whole looks no older than today. I also have no idea what half the chemicals he is talking about. Amazing.

Your instructions were unclear, I ended up addicted to methamphetamines for the past several years

NileRed, your videos are great; I have learned how to make many interesting things from you. That said, I have a n00b question: how does the aquaregia not utterly destroy the coffee filters and the plastic funnel?

@bagniacz3264

3 жыл бұрын

Aqua regia don't really disolve plastics well. I guess that the funnel was made out of HDPE or PP plastic which are reasonably resistant to acids. Filter paper though, I think it would react with it, I assume it just hadn't have enough time to destroy it.

Hi man! Your channel is great and I learn a lot from it. Gold recicling is a thing that needs a lot of reasurch and practice. What I've probably spotted in your video, and what I think is a mistake is that you did not neutralise the aqua regia solution before adding the metabisulfite, which resulted in immediate re-desolving of the perticipated gold, which one can see on the the immediate gas that was emmited after the addition.... I made that mistake and it cost me maybe 10-15 g. of gold and me running around trying to fix things... What do you think - IMO you have to neutralise with urea or pottasium bicarbonate before SMB addition... Waiting for your thoughts on that... Regards form Sofia, Bulgaria!

@gabrielsanabriaibieta

Жыл бұрын

How much urea would you add? Just as much as needed to get a neutral pH?

This is really satisfying

Suddenly this became a lot more relevant

2016: Extracting gold from computer parts 2020: Extracting computer parts from gold

I feel that crushing the parts or grinding them prior to adding the acid can make the process faster and might give more gold as the surface area of reaction increase. But again this can only really work if the suspension made is not allowed to settle and you have to make sure not to waste a lot of the powder from grinding it.

BIG thumps up to this boy.. love it

Great chemistry lesson!

This guy rlly gets gold from anything mad respect for you bro

I've watched your videos for years and I'm a huge fan of your channel. I have a proposition, do you have a way I could contact you? Basically I have a few buckets of gold ore, here's the thing its mixed with tellurium. There is even a big huge chunk of elemental tellurium. Ive read that its one of the most rare of all finds I've also read it can be slightly radioactive. If you would be interested in processing some of this ore for a how-to video on the ore or if you have any use for the tellurium as well.im not exactly sure about shipping the hunk with the elemental tellurium though because I'm not really trying to break any crazy laws or anything

@MerlinTheBird

2 жыл бұрын

I hope you get a response! I'd love to see a video on that. I don't know anything about tellurium at all.

Now this is some real content

This is a new way to get rid from some electronic parts and save gold for the future

is the recovery from processors the same as from RAMs? I mean, should I do something different to separate the gold from the metallic connections, or it's the same as you do for RAMs?

@annya26

Жыл бұрын

why are u trying this bro

Could you please make video about extracting silver from x-ray films

@ExpiredCartonOfEggNogg

8 жыл бұрын

I would watch this

@nixietubes

6 жыл бұрын

+Lord_Lammington Me too

@Enjoymentboy

6 жыл бұрын

Here's what you're looking for. Sreetips is pretty much the best on youtube and truly covers the entire process. kzread.info/dash/bejne/Yqiij8Npg5OsdJs.html

@cheesecakelasagna

5 жыл бұрын

yo!

6:45 you can also tie a loose knot in the air tubing and slowly tighten it to get your desired bubble rate

The fact that it costs more to seperate the gold from the computer parts, than the amount of money the gold is worth

My Siri went off at 6:45 when you said it was really important

@YouBuyGoldcom

8 жыл бұрын

Did you see how Apple got about $40 million in gold from old phones reported recently?

Did you know that a lot of people in Africa actually make their living doing this?

@GogiRegion

6 жыл бұрын

(+prophetchannel) And a lot of those same people also recover data on the hard drives and sometimes find government data (from the master cryptographers) that can be sold. Most of the time it’s just regular hard drives where you find normal people things.

@chr1s83

5 жыл бұрын

Sadly a lot of poor Africans will burn electronics to extract various metals. They don't realize they inhale dangerous fumes and poison nearby drinking water sources which causes horrible birth defects.

@franc5016

4 жыл бұрын

@@chr1s83 sadly? Lol luckily instead

@somethingsomething1237

4 жыл бұрын

@@franc5016 whAt

@chr1s83

4 жыл бұрын

@@franc5016 maybe you didn't read my entire comment. It poisons rivers and leads to horrible birth defects in people and animals

chemistry at its finest

Why is this so fascinating.

Tutorial: how to clean ur ram sticks

Nice new icon dude

@ltnugget

8 жыл бұрын

It looks really good

@NileRed

8 жыл бұрын

Thanks!

@AdamNoone

8 жыл бұрын

NileRed ayyy, no problem sciencebro

@the1derpface

8 жыл бұрын

I preferred the old one

man , it got recommended now(finally)

Next video will be making a bomb out of paper, I swear this dude can make everything out of anything

I just realized that this was made 3 years ago..

@soggy.crackers5450

4 жыл бұрын

Some tho

Me: I would like to be rich. My KZread Recommendations System: Yes.

"At the time of this recording I didnt have any cyanide" hah! Gosh, I love chemists. I love that that wasn't even a joke lol

Cool video! Have you ever done one on recovering silver and maybe antimony from a sulfide ore ?