📝 $10 Million to Mine an Asteroid. $105 Million if it Works. The most profitable platinum mine on Earth - in South Africa - runs at about 14% gross margins. @MattGialich of @AstroForge thinks the company can mine platinum group metals (PGMs) at at a gross margin of 90%. They just have to go to space to do it. The plan: Send a 440-pound spacecraft 10 million miles across the cosmos, magnetically dock it to a chunk of rock and metal hurtling through space, blast it with lasers, and then fly…