Share buy-back

On-market buy-back of Rio Tinto plc shares

Date	Shares bought	Price	Cost £m	Cost US$m
24 February 2012	550,000	£36.72	£20.2	$32.1
27 February 2012	550,000	£36.40	£20.0	$31.9
28 February 2012	450,000	£37.32	£16.8	$26.8
29 February 2012	475,000	£36.66	£17.4	$27.6
01 March 2012	500,000	£35.81	£17.9	$28.4
02 March 2012	150,000	£35.89	£5.4	$8.5
05 March 2012	400,000	£34.57	£13.8	$21.8
06 March 2012	400,000	£33.69	£13.5	$21.3
07 March 2012	300,000	£33.90	£10.2	$15.9
08 March 2012	300,000	£34.62	£10.4	$16.3
09 March 2012	250,000	£34.71	£8.7	$13.6
12 March 2012	400,000	£34.71	£13.9	$21.8
13 March 2012	400,000	£35.12	£14.0	$22.1
14 March 2012	400,000	£35.26	£14.1	$22.4
15 March 2012	400,000	£35.25	£14.1	$22.5
16 March 2012	400,000	£35.87	£14.3	$22.8
19 March 2012	400,000	£35.92	£14.4	$22.8
20 March 2012	500,000	£34.83	£17.4	$27.5
21 March 2012	400,000	£34.61	£13.8	$22.0
22 March 2012	400,000	£33.39	£13.4	$21.3
23 March 2012	400,000	£33.34	£13.3	$21.3
24 March 2012	324,000	£33.74	£10.9	$17.3
Total	116,862,405	£37.47	£4,378.5	$7,000.1