Dry Point. 

"SELF PORTRAIT", PIOTR SZUREK

Dry point is a form of intaglio printing in which scrapes are made into a metal surface which causes ridges to be made on the surface.  These "ridges" then retain ink so when the plate is printed very fine lines are made on the paper. This process is a hard one to master.  One can use different tools to make different markings.  As seen in the print above, there are multiple techniques that may be used to create depth within a print.  The slightly grey areas were more than likely created using a metal roller, where as the darker, bolder lines were created using deep gouges.  

I have done intaglio prints and they are very easy to over work. A good tip is to always run test prints to see how the work is progressing, you can always take off from a block, but you can never add on.