(tables up to date before game update 14 april 2017)
after that update you will see ql of vein, if you will see presence of it(tested on 2 characters at 60 and 99,75 prospecting)
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I just found that faint traces of Sandstone seem to be unlocked at Prospecting 47, but it was on WU so needs confirmation on WO.
[20:32:59] You notice a faint trace of something, but cannot quite make it out (south of east).
[20:33:01] Prospecting increased by 0.0113 to 47.0022
[20:33:08] You spot a faint trace of good quality sandstone (south of east).
[[User:Veryth|Veryth]] ([[User talk:Veryth|talk]]) 11:46, 26 March 2019 (CET)