Geology & GeoMetallurgy

Geology & GeoMetallurgy 2017-04-04T06:58:01+00:00
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Started by rios
I am starting a new gold mining project in Zimbabwe. I have contacted a Geologist and Geophysicist who did a Magnetic Survey on the target area. He also did a Resistivity and I.P. Survey. No other method was used and one has to dig 8 meters into muds...
Last replied to by rios
I  picked  rubble  from the  ground  and  took  100g  sample  for  fire  assay.  The result was 26g/ton.  That  is  quite  encouraging
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Started by Happiness
I need a scenarion where gravity method is deployed for inverstigating an ore body in contrast to the surrounding  
Last replied to by BAUD
Gravity separation is a concentration separation process in which minerals are separated from each other based on the difference of their specific gravity in a fluid medium. The applicability of grav...
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Started by Obersturmbann
What are the positives vs. negatives for BlastHole vs. Reverse circulation during G.C in relation to sampling errors?
Last commented on by Gravydave
Hi Dizzy, the file is no longer there. Is it still available somewhere? Cheers.
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Started by Witzcat
Dear experts, I would like to summarize all metals used for producing a car by calculating the mineral raw materials needed for each metal contained in a car. Of course I understand that each location and lagerstatte is different and there is not re...
Last replied to by David
This is a tough one. I did something similar just for the iPhone 6. https://www.usgs.gov/ was useful. I never did find what you are looking for exactly. I had to do math and plugin basic assumptions....
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Started by Moneer_Noor
we have several quality issues at magnesite mine (ultramafic alteratoin type). we are sampling 1 sample from blasthole material which depth in 4 meter for each hole to grade conrolling ROM. several quality issue is recorded. the mine material qualit...
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Started by Nugget-hunter
identification of nugget of native metal found on the edge of granite country in northern Queensland Australia. SG of 5.4 and does not attract a magnet.    
Last replied to by Terrance
Process for extraction of platinum group metals from chromite-bearing ore US 4295881 A ABSTRACT A process for treating chromite-bearing ores to obtain useful mineral values, especially platinum ...
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Started by jlpalacios
Hi,   My name is José Luis, and I am doing my PhD about the assessment of mining/metallurgical processes by applying the Second Law of Thermodynamics. I am on the stage where I need to start to model a mining process. Would you mind telling me, w...
Last replied to by David
https://www.911metallurgist.com/blog/mineral-processing-extractive-metallurgy-methods https://www.911metallurgist.com/blog/mineral-processing-flowsheets
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Started by David
How can I know the price charges as well as the Recuperations of plant of a Silver Deposit in a Scoping Study?    
Last replied to by David
somebody hired you for this?
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Started by Simon-Flotation
During a recent visit to a copper mine in Chile, plant metallurgists mentioned they got colloidal silica in their ore, and it cause some process problems. I guess it is non-crystalline silica or amorphous silica, it has the same chemical structure wi...
Last replied to by Robert
There seems ample evidence that amorphous materials are present to surprisingly high extent in orebodies as mined as well as being created by reactions during processing. This includes siliceous, oxid...
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Started by Bluegene66
Combination of high grade Zinc/Gold in a VMS system is very rare ie: 5m of 12% Zinc 14g/t Gold 1%Cu in a core sample. Can someone explain the structure and the significance of this unusual occurrence. Thanks.
Last commented on by Bluegene66
Hi Bob, the Fe content is 6%. Is 6% a high value and what would a high/low Fe content represent? Thanking you in advance.
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Started by Biglizer
Hello everyone I have some few questions to ask:  I encounter an outcrop of quartz vein larger more than 5 feet wide,first assay of a sample shows about 0.4ppm,i decided to do trenching and pit sampling...few samples by sorting show few gold by pa...
Last replied to by mkdevarajan
There are many places where isolated small quartz veins may give high grade gold mineralization which may support artisanal gold mining. But they may be far placed from each other that commercial mini...
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Started by Rahil Khan
It is common to find readily usable drill core sampling policies that many exploration sites use as part of their assay and prep labs procedures.Drill core being in many cases the only sample material available for early metallurgical testing.
Last replied to by Aminpro
At Aminpro Labs we do quite a few geomet studies per year.  With help from geologists we first select ore domains by alteration and lithology and sometimes we take those and may divide them by low or...
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Started by Chifita
I recently came across such a mineralisation from an area with a lot of Hematite-Magnetite and just on the peripheral zones of the Lufilian Arc in Kasempa District of Zambia. I carried out a research which indicated that it was acicular malachite! ...
Last replied to by Mathias
Regarding the weird looking malachite, this mineral is readily soluble in weak acids. So it should reacht with hydrochloric acid. Did you test that? Regarding the other material. Frankly, I don't kno...
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Started by Charlie
Hello guys, does anybody know what variables are needed/ taken into account to establish an optimum ratio for ore blending? I'm blending two different Pb-Zn ROM samples (low and high grade).
Last replied to by Sugar Watkins
Are you trying to process "average" quality for process stability, tonnage, etc or are you blending to a target metal throughput or recovery? Take into account tonnes available of each component, grad...
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Started by Oberfuhrer
What is the maximum and minimum sampling interval that is suitable for drill cores from a first phase drilling in a porphyry Cu-Au deposit?
Last replied to by Paul Morrow
There is no simple answer to sample length, you need to consider geology, mineralisation, structural controls, drilling methods, mining methods, sample preparation techniques and ultimately is the cop...
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Started by Kumar Choudhry
I am wondering about correct sampling procedure from a Full 30 tonnes Dump-truck of Iron ore with the top size of 30-35 Cm. would someone kindly help me to provide any literature.This sampling is required to provide the proper feed to the beneficiati...
Last replied to by Jean Rasczak
What you are suggesting is a very tough sampling problem at that top-size - much like the problem of draw-point sampling in underground cave mining methods.Unfortunately sampling theory would indicate...
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Started by Subhash-Kumar-Roy
Please could any one assist me in sampling procedure of Tailing dumps and low grade plies?
Last replied to by Ace Levy
It is essential to separate tailings, or other fine-grained material amenable to easy coring, from low grade stockpiles, or any other waste rock heap, which is particularly challenging to sample. It m...
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Started by Obersturmbann
I’m just wondering if anyone knows any good papers on the QA/QC of assay data.To date I have only been able to find one "Quality Control of Assay Data: A Review of Procedures for Measuring and Monitoring Precision and Accuracy" by Marat Abzalov, wh...
Last replied to by Obersturmbann
Thank you for the suggestions and help gentlemen, I'll follow them up in the next few days. If I come across any similar open source papers I will share them through this forum.
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Started by Helena Russell
Can anyone help me understand how to pin down possible reasons for getting only 37% of my original assays vs. pulp duplicates data plotting within 10% when I generate a HARD plot? I have over 400 pairs of data from three different labs. At each of th...
Last replied to by Ace Levy
Unless your gold is very fine then you are likely to get a fair bit of noise from the pulp duplicates. The first thing to check is how is the duplicate pulp collected - if is taken from jus the top of...
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Started by Oberstorm
What is the maximum and minimum sampling interval suitable for cores in a porphyry Cu-Au deposit?
Last replied to by John Koenig
That is a good question. Porphyry Cu deposits are of very substantial size, and thus are typically mined using large-scale bulk tonnage methods. Consequently, ore blocks are usually estimated that are...
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Started by Marshal Meru
I need some advice, in different process to sampling (croncretly), so determination of QA/QAC.
Last replied to by Marshal Meru
I will visit this website. Do you know? I've some experience years in geologist. But now I want to be complete in different area in mining. I 'm based for moment in Burkina Faso.
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Started by Obergruppenfuhrer
I am among those with serious doubts about statements of absolute scientific truth. In reality we only process models of truth to enable us to rationally predict outcomes and connections to currently accepted science. This point of view categorically...
Last replied to by Alan Carter
I was curious as to whether there would be much comment on this.Given that you went to the conference on Sampling Theory I presumed you would be in a position to answer your own question; however I no...
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Started by Tony Verdeschi
http://is.gd/mQyFQ0. - I was contacted by this start-up the other day and wondering if anybody has been involved in any testing and could give some independent feedbackUnique Volume Instruments for Drill Core Scanning. Minalyze develop volume instru...
Last replied to by Ace Levy
The question about the thickness of investigation of pXRF is essential, and can be easily linked with the statistical meaning of the cylindric shape of a core, its splitting, and the issue of lab/pXRF...
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Started by Tony Verdeschi
Today I updated to sampling site image to a thing still done on may mine sites - sampling a dumped load of ore anything from 50 to 100 t or more in a pile.The usual process is collect a number of fragments from the pile then assign the "maybe" materi...
Last replied to by Carl Jenkins
Some time ago I had to design a sampling exercise for a large old (more than 30 years since the mine closed) waste rock dump of material that contained disseminated monazite and sulphides in some of t...
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Started by Carl Jenkins
RC Open pit grade control - how many benches? How far ahead in space and timeWhat's a workable number of benches to drill using RC or grade control? Say the benches to mine are 5 m. Three benches or four in one pass? Why? How much to drill in front o...
Last replied to by Bob Mathias
Provided the Resource holes are done with a similar drill method and hole size as your grade control drilling (ultimately QQ plots to ensure no bias between drill programmes) then Yes use your Resourc...
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Started by Bill Fraser
Today I update the site's Hero image with two scatter plots of replicate samples from two drill rigs testing the same deposit. Rig A used a dump box and riffle splitter. Rig B used a static cone splitter. I have my interpretation of what is happening...
Last replied to by Sugar Watkins
It’s difficult to make a final judgement without more information. Could do with seeing Q-Q Plots to establish systemic bias and photos to establish set up - photos will probably explain most things...
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Started by Ace Levy
When including CRMs to monitor accuracy in a drill sampling programme the recommendation is to use more than one CRM - but what about when there are multiple variables to monitor (like sulphur and carbon). What's the best cost-effective strategy here...
Last replied to by Standartenfurer
Just coming back to this, you may have seen the paper by Nigel Brand on gold homogeneity in CRMs. Interesting data and not what I thought in terms of individual performance.
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Started by Carl Jenkins
As part of QC it is frequently recommended to use quarter core to establish that the original half core submitted is Representative. Is this achieved as there is a volume variance issue comparing half core with quarter core?Submission of quarter core...
Last replied to by Sudhirkumar
I have come late into this discussion but I wish to share the following. The 1/4 Core duplicate submission is good practice and does not need to be submitted into the lab at the same time with the hal...
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Started by OberstGruppen
I'm working on Exploration of Copper Strata bound Deposits "Manto Type Cu-Ag", and well I want to know about the Geo-chemical signature of this type of deposits?
Last replied to by Jean Rasczak
I have an old paper on meta-advanced argillic minerals, if you like.
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Started by Helena Russell
In stratified samples if we lost one strata how to deal with this situation
Last replied to by Obergruppenfuhrer
Following from earlier remarks, I would suggest that if you wish to find an optimal estimate of the missing sample assay, you should Krieg the value using the surrounding values. The process of krigin...
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Started by Oberfuhrer
Recently I did the heterogeneity test, following Pitard´s procedure, and the results showed a need to sample big masses in order to lower my FSE. I have not identified nor remove any outliers, because the grades retrieved from the test were lower th...
Last replied to by Maya Rothman
Time involved in explaining an outlier often pays greater dividends than iterative complex statistics. In the context of sub-sampling, if an outlier cannot be explained, a duplicate of that specific t...
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Started by Sturmbann
I'm looking for some suggestions on how to normalize soil assay data; it comes from a similar environment but from different labs with different LDL any suggestions?
Last replied to by Marshal Dienes
Subset the samples from the overlapping area and create a QQ plot, if all the quintiles plot on the first bisector (45degreees) then the different lab data is sufficiently similar to treat as the same...
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Started by Dizzy Flores
Twinning Drill holes - often suggested to verify existing mineralisation, for example for resource due diligence.Since mineralization is often heterogeneous, it seems to me that we are testing short range variability and not "twinning" the existing d...
Last replied to by Ace Levy
Tele-viewers can be inserted into RC holes and measures structural information. Diamond drill core is best if you can afford it.
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Started by Paul Morrow
I would like to understand the differences between delimitation and extraction errors because many times i think the sample suffered from both. What circumstances do you have both or either error?
Last replied to by Bill Rico
It is always nice if/when a procedure is available, which results in a valid estimate of the Total Sampling Error. Such a procedure is actually easy to set up, but one would likely have to know enough...
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Started by Rahil Khan
Does anyone have a free accuracy and precision checking software that allows one to easily plot Thompson Howarth, HARD, ARD, QQ Plots, Scaterplots. Even if it’s an excel based programme?
Last replied to by Bill Fraser
Use Snowden's Supervisor. But half a day setting up in excel would do the trick just fine.

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