Standing at the tramway exhibit you are about midway between the Puerto Rico mine in Mexico and the tramway terminal at the top of the mountain above Ernst Valley. There were actually two tramways. An earlier, smaller, tram was built near the current Port of Entry. Remnants of the larger operation can still be seen along the Ore Terminal trail.  At the terminal, the ore was shipped via wagon to the railroad in Marathon on a road constructed specifically for ore haulage.