Castillo Copper Ltd (ASX:CCZ) is set to acquire a majority share in the Harts Range niobium, uranium and heavy rare earths project in the Northern Territory, through an earn-in agreement for which it has met all the precedent conditions. According to the deal, CCZ will take on 85% of the play – located 120 kilometres northeast of Alice Springs – where historical assays from 28 rock chip samples have shown grades of up to 23.2% niobium (Nb), 12.7% ranium (U) and 12.7% heavy rare earth elements (including 2.85% Dy, 0.32% Tb, 14.9% Ta). Following a recent field trip to the area, the company team …