northwest The importance of research
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australian electronic gold prospecting forum.com  |  Common interest forum.  |  General chat and discussion forum  |  Prospecting tips and detector techniques  |  Topic: The importance of research 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: Thursday July 15 2010 15:17:50 AEST PM »

The importance of research
Another attribute of consistently successful prospectors is that they do very extensive research to find the best areas to maximize their chances of success. Many have very large resources of maps, historical and modern exploration reports and their own notes. Where does one get this research material from? Well one way is from this forum where you can download historic reports from many goldfields. In Victoria a great deal of the historic reports and maps can be obtained from Energy and Minerals on CD ROMs or hard copy eg geological survey reports and maps. There is also a database of relinquished El’s or licenses with accompanying reports as to the work carried out. I have obtained a great deal of good historic material from old newspapers eg Marlborough and Dunolly advertiser and other newspapers which are available on micro fiche from the Melbourne library. Local historical societies often have a lot of good local historical information. Old books are another great source of valuable information so it pays to visit antiquarian bookshops. There are many other sources of historic information; one that I have found valuable is from the prospectuses of gold exploration companies or their annual reports. Most prospectuses contain information from consultant geologist as to the prospectivity of the area that the company intends to explore. Frequently an overview of the mining history of the area is included in the geologists report. Below is an extract from such a report.

Let’s say we decide to go detecting at St Arnaud Victoria. Well where would be the best place to go detecting? Look at the portion of the report in quotation marks. It tells us that the alluvial derived from the Bristol reef line were the richest on the goldfield. Logically therefore the best places to start detecting are tops of any gullies   that tend away from the line of strike of this reef line. Further research would establish whether east or west trending gullies were the richest. Any unmined ground down slope from this line would be worth detecting, particularly in the vicinity of any surfacing. Detecting should be carried out parallel to the strike of the Bristol line to maximize the chances of picking up small runs or floaters missed by earlier miners.
Research is critical to success.
Doug :)

Previous Mining and Exploration
Mining History
Alluvial gold was first discovered at St Arnaud in 1855 and was quickly traced to its source in outcropping reefs. By 1860, forty-seven hard rock mines were in operation.
Most of these initially closed at or near the water table at 60-90 m in depth due to either problems with handling the water or sulphide-rich ores being met which could not be treated with the simple gravity technology used at that time.
In detail, mines closed first due to water in the late 1850’s and early 1860’s only to be reopened under new management shortly afterwards when capital was raised for pumping equipment and the small leases amalgamated into larger groups under new companies. These new entities then produced for a few years until the sulphide content of the ores caused either closure or further amalgamation.

Specialised sulphide treatment plants were established later and sulphide concentrates treated to yield up to 50 g/t Au. Several lines of reefs were worked and were known as the West Field, Bristol, New Chum, Nelson and East Field lines (Figure 7-4). The West and East Fields were of minor importance.

“The Bristol line was 1,500 m in length and was worked to a maximum depth of between 90 and 240 m in five mines. This line had the richest alluvials associated with it and the upper part of the Bristol mine was produced at a similar grade and tonnage to the Lord Nelson mine further east.”
doug happy face
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All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
eurekagold
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« Reply #1 on: Tuesday July 27 2010 11:29:09 AEST AM »

hi doug
excellent advice theres plenty of info out there to research and the places you described to obtain it is very helpful to us all thanks theres so much to learn from the old timers
regards eurekagold
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Doug
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« Reply #2 on: Tuesday July 27 2010 12:32:37 AEST PM »

  
hi doug
excellent advice theres plenty of info out there to research and the places you described to obtain it is very helpful to us all thanks theres so much to learn from the old timers
regards eurekagold

Glad to be of help! I will gradually put up more historic info to help people with their gold research.Research is one of keys to success because you can't find gold where it does not occur! Most of the most successful  gold prospectors I know spend as much time on research as they do detecting!
doug  happy face
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All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
fencejumper
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« Reply #3 on: Friday February 18 2011 16:44:28 AEDT PM »

yep good stuff doug
have not been on here for age's cause i got sick of all the whinging about minelab
(too dear,no good,drip feeding tech,i could do better,blah blah) even though those same people use minelab,
but you have given me a reason to come back and put up with that stuff by putting up those links.
thanks for putting in the time...keep up the good work respect
cheers fencejumper
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