Contact-to-contact

English to German Tech/Engineering Mining & Minerals / Gems

All,

I am translating a report on exploration for Lithium.

The sentence in question reads:

Measured and Indicated resource at a cut-off grade of 0% Li2O as the veins will be mined ***contact to contact***.
It is a footnote to a table that lists the amounts of "Measured", "Indicated" and "Inferred" resources.

I have found the term in the same context, e.g. at:
https://www.athenaresources.com.au/projects/byro/
http://www.minsocam.org/msa/Special/Pig/PIG_Articles/Cryo_Ge...

What is the correct term in German?

Source text is from Australia; target is German.

Many thanks.

Peter