Sampling and the estimation of gold in a placer deposit by Fansett, George Richard

Cover of: Sampling and the estimation of gold in a placer deposit | Fansett, George Richard

Published by University of Arizona, Bureau of mines in Tucson, Ariz .

Written in English

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Subjects:

  • Gold mines and mining.

Edition Notes

At head of title: ... University of Arizona. Bulletin.

Book details

Statementby Geo. R. Fansett, 1916-17.
SeriesArizona. State bureau of mines. Bulletin, no. 51. Sampling series no. 1
Classifications
LC ClassificationsTN560 .A7 no. 1
The Physical Object
Pagination1 p. l., 17 p.
Number of Pages17
ID Numbers
Open LibraryOL251967M
LC Control Numbergs 17000115
OCLC/WorldCa8599582

Download Sampling and the estimation of gold in a placer deposit

The sampling and the estimation of the gold present and recoverable play a very important part in the history and development of all placer deposits. For this reason everyone interested in placer mining should know the best methods of working this class of mineral deposit.

Sampling Natural Exposures. Whenever a gold pan is used the result not only proves or disproves the presence of gold, but also usually, shows accurately the amount of gold contained in the sample chosen. Panning along a creek bed thus is the most elementary method of.

(1) The Sampling of the Deposit, (2) The Testing of the Samples, and (3) The Estimation of the Total Gold Present and the Gold Recoverable in the Deposit.

A placer is a deposit of mineral-bearing gravel, sand or soil. The commonest forms referred to are gold placers, tin placers, and plati-num placers. The same method of procedure can be used. The sampling of placer deposits by drilling or, more precisely, drive-pipe sampling, is discussed in detail by Janin.

He states that the Keystone no. 3 traction machine is used generally in California. The usual casing is 6 inches inside diameter and 3/8 inch thick, in 5- to 7-foot sections.

Drilling without casing is not good practice, and high values in a hole so drilled cannot be accepted. Sampling placer deposits is a little different from sampling a lode or vein deposit, because of the nature of a placer deposit.

It is not a solid rock, but a sandy or gravelly material, and can be spread over a wide area. The basic principals of sampling still apply, though. First, one must have a. Evaluating a gold placer requires an understanding of the stratigraphy of the deposit and sampling requires a good knowledge of the gold grain size distribution and frequency.

Product Information. Leading mining historian Kerby Jackson brings together five historic publications from the Arizona Bureau of Mines on the subject of sampling and testing for gold, be it placer or lode ed in this publication are "Mill and Smelter Methods of Sampling" (), "Sampling and the Estimation of Gold in a Placer Deposit" (), "Sampling of Ore.

1) Discovery: Attempting to locate a higher-grade deposit of value inside of a larger volume of lower-grade material.

2) Quantification: Extracting and analyzing smaller portions, to gain a perception of how much value exists within a larger volume. The general concept behind sampling is to minimize investment into a specific mining property, or a particular project, until there is. In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes.

The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California.

4) The investigation of an alluvial deposit must be under the direction of a person experienced in the art of placer sampling. 5) During a program, items that must be observed and noted in addition to the sample size and the value of ore must include boulder size and number, volume of clay, bedrock conditions, water, frozen ground, false.

Placer Gold Deposits of Utah Mining Book- Back in Print $ Sampling and the Estimation of Gold in a Placer Deposit $ Gold Deposits of the Valdez District Alaska $ The professional requires knowledge of the natural variability of the gold distribu tion within the deposit, the gold particle size distribution present and the approximate abundance of gold in order to specify a sampling program and minimum sample sizes for : G.W.

Poling, A.J. Reed. Gold Placer Deposits Gold Placer Deposits This question becomes more difficult to answer as the size of the planned operation tion of the amount of gold recoverable and the overall costs of investment and mining is no simple matter and calls for highly experienced engineering skills for any moderate- to large-scale project.

I got a new placer claim. Did a sample pan from across the creek. Lokks good and very dredgable. Leading mining historian Kerby Jackson brings together five historic publications from the Arizona Bureau of Mines on the subject of sampling and testing for gold, be it placer or lode gold.

Included in this publication are "Mill and Smelter Methods of Sampling" (), "Sampling and the. Maureen's research is probably the source material for other fine books on Southwest placer zones. Anyone in California or Nevada interested (OK, obsessed works here too) in a little sampling, crevicing, classifying, and panning would be very happy with this fairly inexpensive book.

She went EVERYWHERE in her research on the paper trail!Cited by: 6. Placer mining / ˈ p l æ s ər / is the mining of stream bed deposits for may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunnelling equipment.

Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and.

These 20 placer mines produced ab oz. of gold inabout 37% of the state’s total placer production. The large mines processed gold at a unit cost of $/ounce., the ADGGS said.

The medium operations did it at $/oz. while the smaller mines required $/oz. Very good book in explaining the why's behind gold being so hard to find. The book shows how to figure out where placer gold should be found. This info will help to find placer gold and the reasons it is found there.

Very good book, makes a lot of good sense. Good reading!/5(42). Placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly.

Included in this publication are Mill and Smelter Methods of Sampling (), Sampling and the Estimation of Gold in a Placer Deposit (), Sampling of Ore Dumps and Tailings (), Sampling Mineralized Veins () and Select Blowpipe and Acid Tests for Minerals ().

We are providing you an opportunity to purchase this digitally re-mastered book Placer Examination, Principles and Practice “While prepared specifically for use by the Bureau of Land Management personnel” to evaluate gold placer mining operations, with the hope that it would be “useful to the mining profession.”Thank you John Wells for being a bureaucrat with a concern.

At Mining Books, you can buy best books on gold prospecting at affordable price. To make order online visit and get best deal. Gold, particularly, has often not moved far, so a minor alluvial gold deposit can result in a major underground gold mine as in Australia’s Kalgoorlie or Bendigo gold rushes.

In other places, most of the gold was in the alluvial deposits as in the Klondike/Alaska Gold Rush and the California gold rushes of the 19th century. Gold Placer Mines. Bulk sampling of complex gold deposits - material characterisation and program design and management Article (PDF Available) January with 1, Reads How we measure 'reads'.

In scope, this book covers problems of placer investigation from initial reconnaissance to comput­ ing the value of a blocked-out placer. It is intended to serve as a reference book as well as a manual for day-to-day work. Its use should help the mineral examiner identify his sampling problems and select.

Man most likely first obtained gold from placer deposits, more than 6, years ago. Placers account for more than two-thirds of the total world gold supply, and roughly half of that mined in the States of California, Alaska, Montana, and deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold.

Placer Gold: The Stuff You Gold Pan For To start off, there are two types of gold deposits: lode and placer. Typically, lode deposits are the traditional veins of ore that are embedded in rocks and minerals.

To recover gold from lodes, miners have to blast, mill, or treat the rock with chemicals to recover the gold inside. The process for the creation of placer gold. Kinds of Placer Deposits A placer deposit or placer is a deposit that formed in moving water where particles/pieces of gold and/or other dense minerals have accumulated because the water flow isn't sufficient to keep them moving.

In many cases, for a placer deposit to accumulate gold over time, the water must be moving fast enough to flush out lighter sand. though the richest placer gold deposits in Washington were worked out bythe early-day placer miner failed to recover all the gold and some still remains hidden in stream gravels waiting to be found by a new generation of placer miners.

In"Gold in Washington," by Marshall T. Huntting, was published by. GRADE AND TONNAGE MODEL OF PLACER Au-PGE. By Greta J. Orris and James D. Bliss. REFERENCE Orris and Bliss (). COMMENTS Placers used for this model are predominantly Quaternary in age and alluvial in nature.

Many of the placer deposits contain a mix of depositional environments and energy level--deposits along minor tributaries have been worked with. Placer Deposit Types From: D. Cronan, Underwater Minerals () Hot Industrial Metal Future Energy, High-Tech Metals Industrial, Economic Where Specific Gravity = Density relative to H 2O (=) in cgs units of g/cm3.

Gold Deposit Quartz Vein Heavy Mineral Mine Sampling Intersection Angle These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

via this sampling technique. The first sample was a low-grade gold ore (about 5 g/t gold) mill feed sample from a South African gold mine. The particle size was 95% mm. The second sample consisted of boulders of high-grade gold ore (about 60 g/t) that were crushed to yield a 95% mm product.

The masses of each of the two samples wereFile Size: KB. The challenge of sampling gold estimation of gold content is only possible with proper sampling practices and process control.

The first deposit presents erratic distribution of gold, with coarse and fine gold associated to the higher and File Size: 2MB.

Successful resource development of a marine placer gold deposit requires continuous sampling throughout the life of mine. The cost of sampling marine placer gold deposits is exponentially more expensive than for terrestrial placer or non-placer gold deposits and thus requires a comprehensive cost-effective sampling strategy.

The gold in a placer. Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prospecting has also become a popular outdoor recreation.

Start studying Exam 4 Review (Final). Learn vocabulary, terms, and more with flashcards, games, and other study tools. The report is devoted to methodology of prognostic-search model construction of ore placer deposit on the basis of its multifactor multitag models under study by logic-informational methods.

The logic-informational model is represented by feature set, informative for solution of prognostic : Nikolay Laverov, Irina Chizhova, Elena Matveeva. HENNING GOLD MINES INC. NI TECHNICAL REPORT EIGHT MILE LAKE PLACER DEPOSIT 1 SUMMARY Property Description and Location The Eight Mile Lake Placer Deposit is located in the Cariboo Regional District of British Columbia, Canada, approximately km north-northeast of Vancouver, British Columbia.

2) Total gold value equals the sum of the gold value in each hole times the volume of each diamond. 3) To find the value per cubic meter (cubic yard), divide the value in step 2 by the value in step 1.

CONCLUSION. There are many ways to sample and many methods to calculate the value of a placer deposit.Gold, Platinum group metals, tin, diamonds, rare earth metals, Thorium, Titanium, and Uranium What is black sand, what is it composed of? Always found in placer deposits; they are a mix of heavy metals such as Magnetite, Illmenite, and Hematite.Herzig, C.

S. / MINE SAMPLING AND VALUING, A Discussion of the Methods used in Sampling and Valuing Ore Deposits with Especial Reference to the Work on Valuation by the Independent Engineer, with a Chapter on Sampling Placer Deposits by C.

W. Purington, Mining and Scientific Press, San Francisco,cl, pages, - 3 - $

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