We had another amazingly comfortable bus ride to Potosi with seats made for children, freezing cold temperatures, the bus driver pumping his discotheque music and the guy next to us competing by blaring Eminem from a speaker instead of headphones. Cerro Rico, the rich mountain, stands tall above the dusty cold city. Potosi at 4090 meters is the highest city in the world and has been developed at the base of Cerro Rico, the mountain that has provided the city with riches for the last 500 years. Although there is little pure silver found there today it is still the mainstay for the people and economy of Potosi and 10,000 men risk their lives every day going to work in one of the 180 mines. I was still a bit unsure if I was going to join Jake on one of the tours into the mine. The thought of dark tunnels deep underground, cramped, confined spaces, fierce heats, the potential of rocks caving in and breathing in dust and toxic fumes was just not appealing to me.