So, looks like I had the mine recipes off.
Assuming they don't change, mines are made from these recipes.
10 elemental trap parts, 10 mechanical trap parts = Weak Mines
25 elemental trap parts, 25 mechanical trap parts, Siberys Fragmenets = Small Mines
50 elemental trap parts, 25 mechanical trap parts, Siberys Fragments, Weak Soul Gem= Average Mines
75 elemental trap parts, 25 mechanical trap parts, Siberys Fragments, Average Soul Gem= Large Mines
100 elemental trap parts, 25 mechanical trap parts, Siberys Fragments, Strong Soul Gem= Deadly Mines
So, the mechanical parts don't increase for each tier, just the other parts of the trap. Probably most rogues will start having a lots and lots of mechanical parts since they will be using less of them, and mechanical traps are the most common in the game. That shouldn't be that much an issue though if rogues make some noisemakers with the extra parts.