I had a devil of a time tracking one of these down, until I figured out it was awarded over a span of less than a year. It's a Rakosi period Meritorious Mining Service Medal, Bronze grade. It was began in early 1956... later that same year was the failed revolution and, after 1957, the same medal continued but with the Kadar arms (fairly easy to get). The Bronze grade was for 10 years service in the mines or 15 years service for mine-related work. The time was retroactive to 4 April 1945 so you can see that this was the only grade that could have been awarded, even though Gold and Silver were, as far as I know, made.
"We are Marching for the Victory of Communist Labour" V.I. Ulyanov (Lenin)
A Gold class Mining Service Medal from the Kadar period, in case. As this medal was for either 25 or 30 years in the mines (I forget which), I imagine the medal was accompanied by a set of black lungs.
"We are Marching for the Victory of Communist Labour" V.I. Ulyanov (Lenin)
Just in, a group to a person who, according to the working theory, was a faculty member at a mining-technical university? Possibly the University of Miskolc (Miskolci Egyetem)?
-- Jubilee Medal of Liberation
-- Meritorious Service Medal for Miners, gold
-- Meritorious Service Medal for Miners, silver
-- Meritorious Service Medal for Miners, bronze
-- Excellent Instructor
Since some people are like the collectors of German medals and always want to see backsides (back sides?), I have included that image too.