I was associated with drilling the Siljan Ring well in Sweden (Gravberg - 1) back in the 80s. By all indications hydrocarbons were found.
Many still debate this for one reason or another.
Thomas Gold provides compelling evidence of the abiogenic origins of hydrocarbons. Makes for hopeful reading if you like that sort of thing.
Remember the effort by the Russians to drill the deepest hole in the world? That took place not far from Sweden over in Nikel Oblast ~ right near the Pechanga river.
Most of that territory consists of ancient oceanic crust turned 90 degrees revealing the layers of Banded Iron Formations ~ making it one of the world's greatest sources of high quality iron ore (stretches all through the North from Russia into Sweden). Right there East of the Norwegian border there's Nikel, and the hole and the degraded remains of a very large Nickel-Iron Meteorite.
Anyway, it turned out to be a stupid idea to drill that hole in that area even though the Mohorovičić discontinuity is at it's shallowest (for a surface site) in that area. They gave up after more than a decade of drilling ~ and finding nothing.
Bet when that sucker hit that area and tipped over the banded iron formations it cracked the "crust" ~ allowing some upward movement of mantle material into the crust.
I am much more interested in the residual gold flour in that nickel iron meteorite. Does anyone have any idea if that was found yet? And was that iron pyrite or magnetite? Makes a difference in how much gold you can derive.