Dear Dr. Buchner,

please find some chemical information on the Triassic-Liassic transition in southern Germany. The output of precious metals is certainly not very high. To highlight this comment, I add also a paper on the Early Paleozoic Graptolite Shales which contain little gold and silver

Dear Dr. Buchner,

sorry I pressed the wrong button and my forwarding of the message was premature.

It is impolite to dispatch a message without greetings.

Viel Glück

Harald G. Dill

Dear Dr Dill,

thanks a lot for providing these relevant papers.

Alles Gute!

Elmar Buchner

Dear Dr. Buchner,

for a work I did on the Buendnerschiefer formation of the Alps, I compiled some compositional data of black shales from various locations. Attached are a table and a spreadsheet for your convenience. Consider also reading the following for considerations on Au and other metals in black shales:

Quinby-Hunt & Wilde (1996). Chemical depositional environments of calcic marine black shales. Economic Geology, vol. 91, p. 4-13

Quinby-Hunt, Wilde, and Berry (1991). The provenance of low-calcium black shales. Mineralum Deposita, vol. 26, p. 113-121 

Maybe you will find intersting also the attached PhD thesis of Mr. Holger Lueschen (UniOldenburg), which is in German.

all the best for this work

Paolo Garofalo

Pyrite geochemistry in the Toarcian Posidonia Shale of south-west Germany: Evidence for contrasting trace-element patterns of diagenetic and syngenetic pyrites

ZSOLT A. BERNER1,

HARALD PUCHELT1,

THOMAS NÖLTNER2 and

UTZ KRAMAR1

Thanks a lot, Paolo!

Best Elmar

Thank you, Jose!

Cheers

Elmar

Elmar,

I beleive that the bigest gold deposit in black shale is the Paracatu mine in Brazil from Kinross. The deposit is formed by deformed quartz veins hosted by black shales. Paracatu is a low grade (around 0.3g/t cutoff) high tonnage deposite. I know that some Ag, Pb and As are also present. There are several papers available on internet about Paracatu, you for sure will find what are you looking for.

Regards

Rogerio Alves