What mining feature is this?

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Here is a French document about old lead mines in the region were I live in France: giving another approach.

This document is very detailed. I translate here only paragraph 17:

"V-shaped rakes (trenches) are more discreet but more widespread. Their oblique edges are extended by two ridges of rejections. Their direction visibly follows veins or small veins. The depth of the visible rake is around 1 meter. Sectionning shows that the exploited veins are extremely thin, in the order of some decimeters or centimeters, explaining the low development in depth of this work. On the other hand, we follow them over important distances, sometimes nearly 100 m. As a rule, these sites are found near underground works, of which they must constitute a complement or a pre-exploitation".

Jean Marie Becker 130

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What mining feature is this?

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