For the record, I didn't reverse engineer all this, I just used one of the many pages out there describing it. ( http://www.icemark.com/dataformats/manic/mmformat.htm )
But it also occurred to me that it might be nice to have these graphics readily available for folk to play with, it would certainly have been handy when I was doing my remake a few months ago! So here's what I've extracted....
So, this is the baddies that come with each level, the items (1 per level), the 8 tiles (left to right per level) in colour, and in B/W, and then Miner Willy himself. There are several "special" baddies, and if I extract them I'll add them here as well.
I might see if I can go and grab the Z Spectrum font from the ROM, because I couldn't find it as a simple strip at the original size.
I'll just mention the sprites move through the graphic, so the animation frame and X position is usually....
frame = 3-((x>>1)&3);
draw_xpos = (*x&0xfffffff8)
|ZX Spectrum 8x8 pixel Font|