Oh I know they alloy picks don't mine up to Titanium - but the Alloy hammers cause Customers to Buy up to Alloy - which believes itself to be higher than Titanium.
I don't think Zinc ore actually exists, At least, I haven't found it yet either - but Brass Ingots can be found at random - There's a specific spot on the map that has a chance of generating 2 grips, 1 grip 1 random any ingot, or 2 ingots (any) - Every reload. - There's a chance to get titanium steel etc. - literally any ingot.
I tried to clarify that I think - That The Picks can only mine up to a very limited seemingly accurate level - Like That's what allll the levels should be.
But the Hammer cause Customers to pop in asking for everything under the sun. - though It doesn't always let you sell titanium to the "Blank" (no metal type) orders. - which I assume means that not every "blank" is the same and not every alloy will "accept" titanium - Like I would assume Brass wouldn't, but even though Steel can't mine titanium, steel seems to be able to accept titanium - And both brass and steel hammers would allow customers to ask for titanium, specifically.