Jan Castro, the non-Executive Chairman of Sierra Rutile, an AIM-listed producer of titanium feedstock industrial minerals, bought 113,750 ordinary shares just two weeks after the group posted a 39 per cent increase in total rutile production for the year. The shares, which were of no par value, were priced at 60p each, costing the director £68,250 in total. It followed a similar transaction on January 11th when he purchased 460,000 shares at 53p per share. He currently holds 1.46m shares in the group, equal to 0.28% of the issued share capital.Fourth quarter rutile production totalled 25,502 tonnes, giving a full-year figure of 94,493 tonnes, while ilmenite production came in at 6,378 tonnes in the fourth quarter and 22,008 tonnes for the full year. The company's share price has risen more than 21% in the past month, equal to 12p. Top Director BuysRotala (ROL) Director name: Mr John GunnAmount purchased: 250,000 @ 43.00p Value: £107,500Sierra Rutile Ltd (SRX) Director name: Mr Jan Alex CastroAmount purchased: 113,750 @ 60.00p Value: £68,250Mothercare (MTC) Director name: Mr Simon Calver Amount purchased: 18,310 @ 325.25p Value: £59,553Andes Energia (AEN) Director name: Mr Rudolph BerendsAmount purchased: 179,628 @ 31.13p Value: £55,918Jersey Electricity 'A' Shares (JEL) Director name: Mr Christopher AmblerAmount purchased: 4,905 @ 285.00p Value: £13,979Jersey Electricity 'A' Shares (JEL) Director name: Mr Martin MageeAmount purchased: 4,084 @ 285.00p Value: £11,639Jersey Electricity 'A' Shares (JEL) Director name: Mr Richard Alan PlasterAmount purchased: 3,875 @ 285.00p Value: £11,044