Jump to content
IronDigger

Gold / Quartz Specific Gravity... Question

Recommended Posts

I have had this gold /quartz specimen for a number of years....and have not been able to figure out the gold weight using the simple formula I found on the internet. For those of you willing to take up the challenge I can give you the dry weight and submerged weight  in grams. I have attempted it a few times but I always come up with a negative number for total grams in specimen. Not sure if it means I have under an ounce or not. So here we go...total dry weight is 242 grams....submerged weight ..and by the way I did it properly...is 71 grams. My estimate is 24 grams ...than it ended up 1.4 ounces.. Hopefully a few of you come up with more of an accurate number...

 

Thanks

Share this post


Link to post
Share on other sites

Do you have a picture of it? Sounds like it's not just quartz an gold. Or maybe a large air pocket in it.

  • Like 2

Share this post


Link to post
Share on other sites

Yup...I get a density of 1.415g/cu.cm. That's lower than pure quartz.

Jim

  • Like 1

Share this post


Link to post
Share on other sites

Jim, I came up with the same density number....just the end result didn't make sense how can it be a negative number? Is it because it has a void or perhaps not all quartz? May just put it in Wink for a few weeks...

  • Like 1

Share this post


Link to post
Share on other sites

Hey IronDigger

I`ve always used the formula  3.1 x the weight in water, minus 1.9 x the weight in air.   With that formula you speci has minus 21.9 grams.  Dave    

  • Like 2

Share this post


Link to post
Share on other sites
1 minute ago, phoenix said:

Hey IronDigger

I`ve always used the formula  3.1 x the weight in water, minus 1.9 x the weight in air.   With that formula you speci has minus 21.9 grams.  Dave    

Hi Dave, so would we say it has apprx. 22 grams of gold....? The minus got me all confused... :)

Share this post


Link to post
Share on other sites

Hey IronDigger. My bad, I didn`t multiply the dry weight by 1.9.  The correct answer with my formula is minus 239.7 grams Dave

  • Like 2

Share this post


Link to post
Share on other sites
2 hours ago, IronDigger said:

Jim, I came up with the same density number....just the end result didn't make sense how can it be a negative number? Is it because it has a void or perhaps not all quartz? May just put it in Wink for a few weeks...

Yeah, as Walker said, must be a void, or large portion of very light rock within it. Maybe you should soak it in plain water overnight, and then do the water weight test again. If  there is a void, and it fills with water, the water weight should be correct. If there is a void, and the water can get to it, you should see bubbles rising in the water.

Jim

  • Like 3

Share this post


Link to post
Share on other sites

G'day Iron Digger

Your submerged weight of 71 grams needs to be subtracted from the original 242 grams, you see it depends on how you do the wet weight, so you should end up with (242-71=171) wet weight then go ahead and do the usual formula thing which gives a healthy positive result of 66.5 grams. 😁

cheers dave

 

  • Like 2

Share this post


Link to post
Share on other sites

I always use this calculator.

http://desert-gold-diggers.org/gold/specgrav.htm

Recently I came up with a negative weight on a specimen like you are doing with this one.  I had to re-weigh the specimen more accurately making sure the wet weight was not touching any sides of a container with the water.

As has already been stated, your specimen should weigh more in water than what you are reporting to us.  Something is wrong if this is a host of quartz.

We still haven't seen a photo of the specimen so no further help can be given.

Mitchel

  • Like 3

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By jinmon
      Hey all! I’m super-new but wanted to say thanks to everyone because I’ve read soooo many excellent posts on this forum before joining and have learned a ton!
      I’m an obsessive newbie in the Los Angeles area who’s recently picked up a Garrett Ace 250 to kick around with my Dad when he visits (we used to detect parks and schools in Maryland when I was a kid with his old Compass). The Ace is fun and great in parks - I’m fond of it - but I’m really more interested in wet sand detecting on the beaches and in gold prospecting. And it just doesn’t handle salty wet black sand well... or find tiny gold.... So of course I’m looking at getting a second detector.
      My Dad is thrilled. My Mom is horrified  🙂
      I was trying to decide between the Goldmaster 24k and Gold Monster 1000, but then the idea of the Equinox 800 snuck in and I was thinking maybe it would be a good beach AND gold detector. But then I really like the Goldmaster 24k in the few videos I could find. But the Gold Monster 1000 is blue and has that lovely little whoop whoop sound....
      I know there’s no “best” detector, and from what I can tell those are all great detectors. But I’m hoping someone can nudge me off the fence. Does anyone have any thoughts about these or other models for use in Southern California? So many beaches, so many reports of gold...  SO MUCH BLACK SAND!
      Thanks in advance for any advice! I know this was long but I wanted to provide enough details of where I am and what I’m looking for to be useful. Also, I’m chatty. 🙂
      -Julie
    • By anguilla1980
      I live in CA in an area where there are literally 1,000s of old gold mines. I have the gold bug and I've saved up to buy a GPZ 7000 specifically for detecting inside old mines for rich quartz ore and outside for buried nuggets (mostly the later).
      This will be my very first metal detector and I'd like to know if there are any "must-have" accessories or this particular detector for what I'll be doing? There seems to be a never-ending list of accessories and I don't want to waste money I don't have, nor do I want to cut myself short after buying the best.
      Also, separate from the detection rig, what other accessories are a must? I'd like to find a pick/shovel combination, an over the shoulder bag. I already have a hardhat with a light, spare flashlight, and a canteen.
      I'm also the sort of guy that will be refining the gold myself prior to sale to obtain the most value (unless it's a gorgeous nugget to sell as-is). I'll be doing a crushing > nitric acid > aqua regia > smelting > casting small bars setup. Of course, I won't invest in any of that until I have enough ounces of gold to start and pay for itself.
      Thanks in advance! This is going to be a weekend hobby for my 16 year old son and I as the next step of the mine exploring we have been doing for years.
    • By tslick
      So I responded to a classified add on the forum from a guy named Sourdough Moe. He has several items posted for sale. I agreed to purchase his book Unabridged ZipZip. I agreed on his price and even added shipping cost. He provided his Paypal info and I sent payment. That was on Jan 2 and I haven't received the book. I have tried to contact him twice through PM's and no response. I have purchased several used items from guys on this and other gold forums without issue. Anyone know this guy Moses Jordan? Sure would like to get the merchandise I paid for. 
    • By Tnsharpshooter
      https://www.garrett.com/hobbysite/hbby_newsletter_en577.aspx
    • By Ezrider2
      Hello I am in northern Virginia and am completely new to the detecting world. I am a gold prospector primarily but interested in detecting in general. 
      I have the nox 800 and the 6" double d coil on the way.  I have watched tons of videos and read a lot about the detector. Is there anyone out there that would be willing to meet up and give me a lesson on how to use it? I am having trouble and would be nice to be able to ask questions and learn from someone. 
      I know it's snowing now and cold but spring will be here soon enough. Thanks for reading. 
    • By Mark Gillespie
      How many here might remember the Tesoro forum, the original one, that went down several years ago.  It had some of the very best adventure stories I've ever read.  Very motivating and the information learned about Tesoro detectors were very good.  At that time I was using the Vaquero and I can honestly say I found a lot of rings with that machine.  The audio, in my opinion was superior for me.  I could tell if a target was a pencil eraser end without digging.  A few years later I bought a Tejon at the advise of Gene Scullion (when he was the owner of Badger Metal Detectors) and wow what a fantastic machine.  The audio again was superior and I found more rings.  But keep in mind these are purely audio machines which lends itself to finding more rings because I didn't have an display to inform me as to what the target might be.  But the dual discrimination feature was a plus over the Vaquero and helped with not digging some junk targets, but still found more rings.  Now it did have a serious drawback and that was recovery speed and the relationship to target masking (which at the time was not published information). 
      But finally after years and the relentless detector advertising on both the internet and TV I gave in and bought my first display detector.   Its been a very exciting journey, detecting that is.  Met many hunters along the way and found some interesting artifacts to boot. 
      It would be nice if there was a way to pull up or locate the original Tesoro forum website.  A lot of lost information and fantastic stories of past hunters and their experiences.
       
×