The most famous Minnesota invention was not water skis (1922). Nor was it packaged cake mix (1947), crisp crust frozen pizza (1979) or even Post-it notes (1980). It was the Lindy Rig, which doubtless ...

Diamond drilling at Crippleback Lake has confirmed a large advanced argillic alteration system with features associated with high sulphidation epithermal and copper porphyry mineral systems Three ...