Guess what's happening at Alto..?, page-4

How do Alto process their ore without MDI?
They either build their own (huge capital cost) or toll treat somewhere.
Quote from an MDI announcement from 28 July 2017:
’Strategically, MDI’s Sandstone mill is within 25km of Alto’s deposits, offering the potential for distinct competitive cartage and revenue upside compared to the nearest operating mills, which are at least a further 150km distant...Ore haulage costs to a distant mill some 150km away or more is equivalent to ~0.4 g/t increase in the ore cut-off grade. For a low grade (e.g. <2 g/t) deposit, this often means a very significant reduction in economic mill feed (Ore Reserves), and hence net revenue, compared to treatment at a nearby mill.’