Abstract: A ramped surface is added to the ball striking surface of the planar club face of the head of a golf club. The ramp diverges from the central portion of the club face to the heel or toe of the club so as to produce a side spin on a golf ball struck by the club head. Where the ramp diverges from the club face towards the toe of the club the spin will be counterclockwise. Where the ramp diverges from the club face towards the heel of the club the spin will be clockwise.

Abstract: A hydrometallurgical process to leach at least one base metal from one or more base metal sulphide feeds comprising the steps of providing a base metal sulphide feed; processing at least a portion of the feed by roasting to reduce the content of sulphur therein to a predetermined sulphur content level; directing some or all of the processed feed with or without some of the unprocessed feed to an oxidative leach step to carry out an oxidative leach step under conditions sufficient to recover at least a portion of the base metal from the feed, the predetermined sulphur content level being selected so as not to exceed that which is required to provide a source of heat for the oxidative leach step and to provide sufficient sulphate to complex the portion of the base metal being recovered