I've just tried testing the plugin and 2 things i couldnt get working, or at least understand.

1, if i have materials and then hit the crater with a pickaxe it doesnt craft me a quarry
2, i can only place quarries onto the crater, and not an actual pumpjack, is this intended?

Within the JSON config file i notice references to quarry can gather oul and also pumpjacks can gather ores. Please can these options be explained in more detail

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#2 Yes, that's intended for now.

why? Will there be a fix?

I also encountered the same situation, can only explode the pit, but there will be oil explosion, can not use picks to obtain oil tankers, can not be placed.