THE author's object is to give a short account of the methods of boring alluvial tin properties in Malaya, and also to outline the methods of concentrating tin oxide by means of jigs. BORING. The tools required are of the Empire or Banka type, and the principal parts are as follows:- A set of 5-ft. lengths of casing, 4 in. to 42 in. diam., boiler tubing being commonly used ; a number of 1 in. to 11 in. square iron rods of 10-ft. lengths and one or two similar 5-ft. lengths, all having tapered screw joints ; four iron hand dogs or lifting tongs ; several clack valve sand pumps ; two clay auger drills ; two chisel drills ; one casing shoe ; four iron clamps, which may be bolted on the outside of the casing, and which have handles 3 ft. long ; one socket, which is screwed into the top of the casing to protect it from injury under working conditions ; a wooden measuring box of which there are two types - (1) A quarter cub. ft. capacity box, inside dimensions 6 in. x 6 in. sq. by 12 in. deep. The depth of the box is divided into tenths of a foot, denoted on the inside of the box by short nails driven into the wood. (2) A half cub. ft. capacity box, inside dimensions 12 in. x 12 in. sq. by 6 in. deep, having a nail driven into the inside of the wood 3 in. from the bottom. This type of box is very much in favour. Bore Sites.-In most cases the bore sites are 'set out by means of prismatic compass surveys and the position of each bore marked by a large peg. They are usually placed at the intersections of two series of lines from 3 to 12 chains apart, forming a number of rectangles.