Which FTSE 100 sector has been the best performer over the 12 months to end September 2017? The mining sector must be right up there, with Chilean copper miner Antofagasta gaining 81 per cent and Glencore 61 per cent. The FTSE 100 was up 7 per cent. Anglo American and Rio Tinto are comparative laggards with gains of 38 and 34 per cent respectively. The latter threw in a dividend yield of close to 7 per cent on its share price a year ago for good measure.