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Ron Layton July 20, 2012 07:05PM
Saddleback Basalt in the US Borax mine, Boron, Kern County, California. I just found these on the web. These publications contain a good write up on the minerals of the Kramer District Borate deposit.

Kramer District Borate deposit minerals part 1

Kramer District Borate deposit minerals part 2

Edited 1 time(s). Last edit at 07/21/2012 05:45AM by Ron Layton.
Chester S. Lemanski, Jr. July 20, 2012 09:53PM

Thank you very much. I printed them out and they will be added to my California library. They will be of significant help when I get to Kern County. Right now I am working up in Sasquach land - Trinity County.

Chet Lemanski
David Zakharov September 28, 2012 10:46PM
Short report about visiting Mt Diablo State Park.

Thank you,
Anonymous User November 22, 2012 02:20PM
Hello all,
what is Kramer District's industrial use of Borax?

Edited 3 time(s). Last edit at 11/22/2012 02:45PM by Wolff-Dietrich Lehmann.
Rock Currier November 23, 2012 06:48PM
I don't understand your question. The Kramer district in California does not have much industrial use for Borax. The big open pit mine at Boron is mined primarily for borax, which occurs naturally in the deposit. It is the preferred ore because they can refine it easily by simply dissolving it in hot water and recrystallizing it. The refinery adjacent to the mine produces a number of different borate products, mostly sodium borates using the recrystallized borax as a feed stock which they then sell and distribute to many customers.

Rock Currier
Crystals not pistols.
David Von Bargen January 17, 2013 03:59PM
To see what are the primary uses of boron containing minerals the USGS Mineral Yearbooks are good resources.
Kris Rowe, Rockhound Field Trip Fanatics! May 24, 2013 11:06PM
Thanks for the great work!

I'm working on plans for field trips throughout Central California, and plan on asking about collecting status for numerous sites.

Lets start with something fairly obscure; the Big Creek-Rush Creek District of Fresno County, CA.

mindat lists numerous claims in that area, and several of the mineral collectors on my website (Rockhound Field Trip Fanatics!) have expressed keen interest in visiting these prolific type localities.

Any assistance that y'all might provide in ascertaining collecting status of the claims within that area would be most appreciated.

Best regards,

Kris Rowe
Admin, RFTF!
Hand-2-Mouth Mining
Chester S. Lemanski, Jr. May 25, 2013 12:09PM
Personally, I have never been to these sites although I would love to collect there! Perhaps someone else will chime in with good information.
Chester S. Lemanski, Jr. June 22, 2013 06:46PM
Onward!! Mariposa County is complete. I am moving on to Tuolumne County now - please refrain from making any changes to this county until after I am finished with it (est. 2 months).
Rock Currier June 23, 2013 02:08AM
Jesus Chet,
They should at least give you a free hat or a few picks of the POD or something. I hate thinking of who mindat might replace you with if you get run over by a truck in Tuolumne County.

Rock Currier
Crystals not pistols.
Christopher O'Neill July 27, 2013 06:40AM

I have California locality question: I have a specimen of massive tan scheelite mixed with white quartz. The label states that it is from the Black Eagle Mine, Glamis, California.

I found the following info on which shows the town of Glamis on highway 78 and the Black Eagle Mine located about 10 miles north of Glamis.

There is also a Mary Lode Mine which is listed in the MINDAT database (Mary Lode Mine, Squaw Peak, Chocolate Mountains District, Chocolate Mts, Imperial Co., California, USA). The Mary Lode Mine seems to be located about 4 to 5 miles south of the Black Eagle Mine.

Do you have any additional info for the Black Eagle?

Many thanks,
Chester S. Lemanski, Jr. July 27, 2013 01:48PM

The Black Eagle is now updated with all available information. Unfortunately, it is on a naval gunnery range - not even I would go there!!

Chet Lemanski
Christopher O'Neill July 27, 2013 10:11PM

Thanks for the info on the Black Eagle Mine and I posted the specimen.
I agree, probably not a lot of collecting going on around there anymore....

Chester S. Lemanski, Jr. September 01, 2013 08:44PM
Today I tidied up the files for these localities. Added refrerences as required (some now published, not "in press") to locality files and species occurrence files. Also added full references to the master species files in the database. Tony! Slow down please.......!!!!

Randall Humiston November 04, 2013 01:24AM
Good Day. Just joined and find the message threads very interesting.

As a relatively new rockhound, I find that one of the most difficult parts for me is knowing what's about in the areas I am in.

I spend a fair amount of time around the Bridgeport, CA area and have not had much luck finding out what might be some interesting rocks and minerals in the area. Just looking for specimen collection for personal display and not anything large-scale. Mainly as part of an educational adventure for myself and my nephew.

Can I get some hints about possible finds and locations in the area from anyone that might know? If not, does anyone know of some reliable resource material that might contain this information?

Thanks for any help you provide.

Chester S. Lemanski, Jr. November 04, 2013 12:59PM

I presume you are referring to the Bridgeport in Mariposa County. Simply type in Bridgeport to the locality search block on the Mindat home page and search for it. You will find a list of old mines nearby. This county was already updated and the information reflected in the files is the best we have right now.

Chet Lemanski
Chester S. Lemanski, Jr. November 25, 2013 05:54PM
Unfortunately, recent changes in online maps by Google has caused Mindat to lose the USGS topo maps feature. There is no suitable alternative at present. Without these maps, the California project has to stop for now. This hiatus will be temporary provided that the topo maps access can be reestablished. If not, the project may continue; however, the data will be noticeably less comprehensive for the remaining files.
David Von Bargen November 25, 2013 09:56PM
The USGS does make 7.5' maps available for download as a pdf file (~20M/file). The ones that you probably would want are the historical series. They often are available from different eras.
William W Besse November 27, 2013 11:26PM

I agree with David. Download the topos from the USGS Map Store. And, yes, the older are commonly better for our purpose. They have not been sanitized.

The rest of this you probably know but just in case and for other Mindaters:

Do you know about TerraGo Toolbar? It is a very good, free tool for finding coordinates and distances in USGS topo PDFs.

You know about USGS MRDS but I am finding the USGS GNIS better in many cases for locating localities.

Chester S. Lemanski, Jr. December 07, 2013 12:26AM

I use the USGS GNIS database daily. There are some drawbacks to it as a stand alone source. It provides coordinates for any feature named on a USGS topo map. If it is not named on the topo, it is not in the GNIS database. Many mines are depicted on the topo as symbols only. The MRDS coordinates must then be used and the topo is a confirmatory tool, especially when the coordinates place it directly, or nearly so, on a symbol on the topo map.
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