The park had many miles of tunnels and shafts, all far out of sight below the surface. I have made a 3D view of the works in the Senador Mine previously, which was a lot of work. I laboriously digitized 2D maps from the literature and built it one tunnel layer at a time. Michael Cox made me aware of the work of Keith Russ and his website on abandoned mines. I was able to contact Dr. Russ and he kindly sent me a DXF file of the New Almaden mines that he made over a decade ago. I used Python to read the file and get it into an STL file to check out, all 47,000 3D faces of it. I made an elevation model of the terrain from a 1-meter LIDAR scan and overlayed a map and labels in glb format.