This is a web-based tool for visualizing resources in a copper mine. If I remember correctly, each cube shows the amount of copper in a 1-cubic-meter area. The app allows you to filter by density as well as zoom, pan and anything short of walking through the mine yourself.

Made with Three.JS. Named after the project lead's girlfriend (he insisted). This was made in 2010; WebGL wasn't very performant back then. However, once I implemented draw call batching, and converted the data into a more compact format, this app ran as smooth as butter.