By Steve Herschbach
Another question via email, with personal references removed. I prefer to answer these on the forum so everyone gets the benefit of the answer plus others can offer their opinions also.
"I am new to metal detecting and, your site here has really helped me out. I have a couple questions that maybe you can help me out with. What are some of the geologic indicators that you look for to determining where to prospect for nuggets? I try to study some of the geology maps but I could use some further pinpointing. I have also been looking at the National map of Surficial Mineralogy. Using the aster and minsat7 maps what are some of the indicators that may point you to higher gold bearing ground? Any help would be deeply appreciated.
Could you point me to some old places where you have found gold? I'm not asking to be shown active patches. Just areas that you feel are worked out. I just want to see what gold bearing ground looks like. This would help me to start to learn the commonalities and characteristics of gold bearing grounds.
Still looking for that first nugget! Thanks again for any info you can provide."
My method is much simpler than that. I basically look for gold where gold has been found before. Think of it like fishing. If you want to go catch salmon you have two options. You can go to where people have caught salmon before - pretty good odds here. Or you can go where nobody has ever caught a salmon before. Very poor odds!
So call it prospecting using history to determine where gold has been found before, and then getting as close as I can to those places. History and proximity. Finally, I may then employ geology to narrow that search in a given area if it turns out the gold is confined to certain rock types.
The first place I normally turn as a rough guide to any new location in the U.S. is:
Principal Gold Producing Districts Of The United States USGS Professional Paper 610 by A. H. Koschmann and M. H. Bergendahl - A description of the geology, mining history, and production of the major gold-mining districts in 21 states. This 1968 publication obviously lacks the latest production figures but it still is a great overview to where an individual prospector can look for gold in the United States. It is a 283 page pdf download so be patient. Pay particular attention to the listed references in the extensive bibliography for doing further research.
You can download this at http://pubs.usgs.gov/pp/0610/report.pdf and find many more useful free books on this website at the Metal Detecting & Prospecting Library
So just for fun let's say I want to go look for gold in New Mexico. The section on New Mexico starts on page 200 and here is a quick summary of the opening paragraphs:
"The gold-producing districts of New Mexico are distributed in a northeastward-trending mineral belt of variable width that extends diagonally across the State, from Hidalgo County in the southwest corner to Colfax County along the north-central border. From 1848 through 1965 New Mexico is credited with a gold production of about 2,267,000 ounces; however, several million dollars worth of placer gold was mined prior to 1848. Mining in New Mexico began long before discoveries were made in any of the other Western States (Lindgren and others, 1910, p. 17-19; Jones, 1904, p. 8-20). The copper deposits at Santa Rita were known and mined late in the 18th century, and placer gold mining began as early as 1828 in the Ortiz Mountains south of Santa Fe. In 1839 placer deposits were discovered farther south along the foot of the San Pedro Mountains. The earliest lode mining, except the work at Santa Rita, dates back to 1833 when a gold-quartz vein was worked in the Ortiz Mountains. In 1865 placers and, soon afterward, quartz lodes were found in the White Mountains in Lincoln County; in 1866 placer deposits were discovered at Elizabethtown in Colfax County, and silver-lead deposits were discovered in the Magdalena Range in Socorro County. In 1877 placers and gold-quartz veins were found at Hillsboro, and in 1878 phenomenally rich silver ore was found at Lake Valley in Sierra County.
The mineral belt of New Mexico is in mountainous terrain that lies between the Colorado Plateau on the northwest and the Great Plains on the east. It is a zone of crustal disturbance in which the rocks were folded and faulted and intruded by stocks, dikes, and laccoliths of monzonitic rocks. Deposits of copper, lead, zinc, gold, and silver occur locally throughout this belt. Some deposits of copper and gold are Precambrian in age, but most of the ore deposits are associated with Upper Cretaceous or Tertiary intrusive rocks. The gold placers were probably derived from the weathering of these deposits. In later Tertiary time lavas spread out over wide areas of the State, and fissures within these rocks were later mineralized. These fissure veins are rich in gold and silver, but in most places they are relatively poor in base metals. In New Mexico, 17 districts in 13 counties yielded more than 10,000 ounces of gold each through 1957 (fig.19).
Figure 19 is a handy map showing us where you want to look in New Mexico and also where looking is probably a waste of time. Click for larger version.
The map shows what the text said "The mineral belt of New Mexico is in mountainous terrain that lies between the Colorado Plateau on the northwest and the Great Plains on the east." Sticking to this area is going to be your best bet. Based just on this map I see two areas of general interest - the central northern area, and the southwestern corner of the state.
The text mentions that placer deposits were discovered at Elizabethtown in Colfax County, and the map shows that as the Elizabethtown-Baldy mining district. Following along in the text we find this:
"The placer deposits along Grouse and Humbug Gulches, tributaries of Moreno Creek, each yielded more than $1 million in placer gold and silver. Another $2 million worth of placer gold and silver was recovered from the valleys of Moreno and Willow Creeks (Anderson, 1957, p. 38-39), and some gold also came from the gravels along Ute Creek. Graton (in Lindgren and others, 1910, p. 93) estimated the placer production of the Elizabethtown-Baldy district prior to 1904 at $2.5 million, and C. W. Henderson (in U. S. Bureau of Mines, 1929, pt. 1, p. 7 40) estimated the production through 1929 at about $3 million (145,138 ounces). The total placer production through 1959 was about 146,980 ounces."
The reference material from the passage above is in the back of the book and is where we can get real details. Google is our friend. This stuff used to take me lots of visits to libraries!
Anderson, E. C., 1957, The metal resources of New Mexico and their economic features through 1954: New Mexico Bur. Mines and Mineral Resources Bull. 39, 183 p.
Lindgren, Waldemar, Graton, L. C., and Gordon, C. H., 1910, The ore deposits of New Mexico: U.S. Geol. Survey Prof. Paper 68, 361 p.
Henderson, C. W., 1932, Gold, silver, copper, lead, and zinc in New Mexico: U.S. Bur. Mines, Mineral Resources U.S., 1929, pt. 1, p. 729-759.
That is more than enough, but let's also Google placer gold new mexico
Lots of great links there, but two jump out:
Placer Gold Deposits of New Mexico 1972 USGS Bulletin 1348 by Maureen G. Johnson
Placer Gold Deposits in New Mexico by Virginia T. McLemore, New Mexico Bureau of Mines and Mineral Resources May 1994
Notice the source of the last one. Most states with much mining have a state agency involved that can be a good source of information and in this case it is the New Mexico Bureau of Mines and Mineral Resources.
That last one is a real gem and contains this passage:
"All known placer deposits in New Mexico occur in late Tertiary to Recent rocks and occur as alluvial-fan deposits, bench or terrace gravel deposits, river bars, stream deposits (alluvial deposits), or as residual placers formed directly on top of lode deposits typically derived from Proterozoic, Cretaceous, and Tertiary source rocks (eluvial deposits). During fluvial events, large volumes of sediment containing free gold and other particles are transported and deposited in relatively poorly sorted alluvial and stream deposits. The gold is concentrated by gravity in incised stream valleys and alluvial fans in deeply weathered highlands. Most placer gold deposits in New Mexico are found in streams or arroyos that drain gold-bearing lode deposits, typically as quartz veins. The lode deposits range in age from Proterozoic to Laramide to mid-Tertiary (Oligocene-Miocene) (Table 2). There are some alluvial deposits distal from any obvious source terrains (Table 2). Eluvial deposits are common in many districts; some of the larger deposits are in the Jicarilla district."
So now we have a lifetime of ideas on where to go and a basic idea of the geology. And an even better map! Click for larger version.
Let's look for specific site information.
1. Go to http://westernmininghistory.com/mines
2. Click on New Mexico Mines
3. Click on Colfax County Mines
4. Click on Elizabethtown - Baldy District
Here you will find basic site information, references, and a zoomable map with alternate satellite view.
An alternate site...
1. Go to https://thediggings.com/usa
2. Click on Browse All States
3. Click on New Mexico
4. Click on Browse All Counties
5. Click on Colfax
At this point note you can browse mining claim information or deposit information. Researching mining claims, land ownership, etc. is another topic but here is one source of mining claim location information. For now....
6. Click on Browse All Deposits or Use The Interactive Map
7. Click on Elizabeth - Baldy
A little more detail than the previous site, including this note "SOME FAIRLY COARSE NUGGETS IN WILLOW, UTE, SOUTH PONIL CREEKS, GROUSE AND HAMBURG GULCHES, MORENO RIVER"
1. Go to https://www.mindat.org/loc-3366.html
2. Way down at bottom click on New Mexico
3. Way down at bottom click on Colfax County
From here you can dig into all kinds of specific site information but the navigation is a real mess. Have fun!
Historic claim staking activity can be a clue. You can get the Big Picture by looking at Mine Claim Activity on Federal Lands for the period 1976 through 2010
OK, that really should have answered your question. As far as places I have been, they are nearly all in Alaska and can be found here
Now, I did all the above from scratch with no real prior information on New Mexico in about 2 hours. You can do the same for any state. However, finding where the gold is really is the easy part. The hardest part by far is finding out who controls the land and getting proper permission for access. In Alaska everything is covered by thick ground cover, so opportunities for metal detecting are strictly at creek level, and nearly always claimed. The process there is simple - find out who owns the claims and get permission for access. In most of the western U.S. there is far less or no ground cover, and so getting in the vicinity of and searching around or near mining claims without being on them is a far more viable option than in Alaska. Or you can try and get permission to access the properties. You still need to be able to track down property locations and owners however.
For private property I subscribe to and use OnXMaps for my PC, Google Earth, iPad, and iPhone. It quickly maps private property and gives you access to tax roll information about the owners.
Tracking down mining claims is easy in the big picture and harder in the details. The Diggings referenced before has interactive claims maps. I subscribe to Minecache for their Google Earth overlay. However, the most comprehensive source with the deepest repository of Land Ownership information is Land Matters. They have online claim mapping with direct links to claims owner information. Note that all online sources have a lag time between the actual staking of a claim on the ground and when it reaches the online systems, if ever. I say if ever because some claims exist solely at the county or state levels and there is no good way to find them short of visiting local recorder's offices or eyeballs on the ground.
Prior thread on finding claims information.
Finally, I am not an expert by any means. This is just how I go about it, but any tips, hints, advice, or information anyone is willing to share on this thread are very welcome!!
By Noah (FL)
EDITED.........For a first timer just doing some experimental nugget hunting would it be worth a GPAA membership for access to the claims or just doing some research and hunting BLM land? Will be in Phoenix visiting a friend after a work trip that ends in Vegas. I am entertaining renting a car instead of flying and trying my luck for nuggets along the way!
What group/club is best for AZ or NV gold detecting claims??? First time detector prospector looking for a nugget!!!
Relic/coin hunter from Florida planning a vacation. Thanks
The recent post on "Lode Claims" discuss a interesting and important subject on involving lode & placer mining claims and access. Beside the good information it demonstrates just how serious miners are about their claims holdings. So make sure you get "express written permission" from the mining claim owner(s) before entering onto their claims to prospect and/or detect.
A word of advice leave your pets and firearms at home and take your trash out with you. If you agree to share a portion of your finds with the owner(s) keep your word. Don't close the door for the next person.
So how do you contact a claim owner(s) to get permission to prospect/detect on a open active mining claim. There are several members far more update on these BLM websites than me and will fill in most of my mistakes and omissions. This should at least get us headed down the road.
Using Foxfire as the browser ( these websites are not user friendly so use the BLM Tutorial and type in information exactly as indicated per the LR2000 samples; use all Caps.
For overall claim filing information and location description (lode & placer); Booklet
On the left margin click on "What we do" then hit "more"; scroll down to the following two topics: Mining and Mineral; Mining Claims and Sites on Federal Lands.
Click on the "Inactive map" located in the upper center of the page; you will see a tool bar along the top of the map for zooming in & out and panning.
On the right margin click the "PLSS" button for bring up meridian, township, range, section grid on the inactive map; click on the +zoom in then click on the ma to move to the area (state) you want; write down the "median, township, range and section" numbers.
Located on the left margin click through and read “Tutorial”, “Help Guides”, “Reference Codes”
Click on “Run Reports”. Scroll down to “Public Mining Claims Reports”
Click on “Pub MC Geo Index”
Click the “Meridian Township Range Section *” and ” County” buttons;
Click “Select Criteria” at the bottom
The “Mandatory Criteria” window will pop up.
Click on the “Set” button for each criteria then the “Close” after selecting or entering the information requested.
“Admin State” select a state from the scroll down window; Close
In “Case Disposition” select “Active”; Close
The “Meridian Town Range Section” (MTRS) window has a MTRS Format sample located on the upper left; use all Caps; enter the information in the box just below “Clear Above Valves” then hit the check button. You can run more the MTRS at a time; click the “Select All” button; Close
“County” select a county from the scroll down window; Close
click “Run Report”
Confirm your selections then click” OK”
The report will include claim names, number, location by MTRS down to the NW, NE, SW, SE corner of the section per page# 10 of the BLM booklet “Mining Claims & Site on Federal Lands”.
Clicking a “claim number” of any individual claims will bring the claim document; the claim owner(s) are listed by name, address and zip code; including the claim size in acres.
The county “Recorders Office” of the county where the claim is located will have copy on file of the claim owner(s), address, claim size, type, and specific location in the section (booklet page#10 sample: 20 acre Placer Claim E 1/2 NE 1/4 NE 1/4 per section, township, range, meridian.)
or you can just join a prospecting and/or detecting club in your area of interest.
Maybe some of you already know about this and have the phone to support it. I have one of the flip phones that nobody wants to steal, so it really amazes me. On his phone he dials up google earth map and it instantly it brings up the boundaries, acreage and name & address of the owner.
It would be fantastic to have the same ap for claims, showing owner and boundaries, no more accidental trespassing.
By Clay Diggins
As they do twice a month Land Matters updated their free Mining Claims Maps. That claims map information is current as of January 1st.
The mining year is now four months along. In the last 4 months there were 6,479 mining claims closed and 14,854 new claims located as of January 1, 2018.
That's a net gain of 8,375 new mining claims in the first third of the 2018 mining year!
As of January 1, 2018 there were 391,907 active mining claims in the BLM database.
That's a big number but it represents less than 1% of all the public lands.