Materials and waste

EN1

The information below provides disclosure under the Global Reporting Initiative (GRI) indicator EN1: Materials used by weight or volume

Input materials

The primary raw materials used by the group include the ore processed during the extraction and recovery of gold from its host rock (direct raw materials). Primary process materials used include non-renewable materials such as liquid fossil fuels, lubricants and solid fossil fuels and renewable materials such as cyanide, explosives, acids and alkalis. These bulk materials are used or consumed during gold processing and are relevant to environmental management in that these must be controlled by the operations to avoid environmental impacts. Cyanide is managed under the guidelines provided by the International Cyanide Management Code.

Direct raw materials

Ore processed (kilotonnes)	2011	2010
South Africa	16,418	17,254
Vaal River	13,585	14,457
West Wits	2,833	2,797
Continental Africa	30,694	29,844
Ghana
Iduapriem	4,310	3,391
Obuasi	2,006	2,635
Guinea
Siguiri	11,454	10,328
Mali
Sadiola	4,827	4,371
Yatela	4,371	2,933
Namibia
Navachab	1,411	1,492
Tanzania
Geita	3,863	4,694
Australasia	3,554	3,617
Australia
Sunrise Dam	3,554	3,617
Americas	24,256	24,350
Argentina
Cerro Vanguardia	1,061	1,001
Brazil
AGA Mineração	1,700	1,561
Serra Grande	1,168	1,190
USA
CC&V	20,327	20,598
Group	74,922	75,065

	Liquid fossil fuels (ML)		Lubricants (kL)
Process materials	2011	2010	2011	2010
South Africa	1.71	5.99	910	2,440
Vaal River	1.50	4.41	366	1,375
West Wits	0.21	1.58	544	1,065
Continental Africa	233.72	232.79	2,962	3,645
Ghana
Iduapriem	22.33	19.12	-	156
Obuasi	-	2.01	NR	NR
Guinea
Siguiri	56.23	57.39	144	93
Mali
Sadiola	8.55	46.65	935	886
Yatela	15.63	13.42	254	421
Namibia
Navachab	3.40	9.1	124	133
Tanzania
Geita	87.58	85.1	1,506	1,956
Australasia	42.06	30.73	NR	NR
Australia
Sunrise Dam	42.06	30.73	NR	NR
Americas	73.21	62.87	2606	2,156
Argentina
Cerro Vanguardia	18.70	16.06	433	378
Brazil
AGA Mineração	7.05	5.88	561	445
Serra Grande	3.59	3.76	196	76
USA
CC&V	43.87	37.17	1,416	1,257
Group	350.69	332.38	6,479	8,241

	Cyanide (t)		Explosives (t)		Total acid consumption (t)		Total alkali consumption (t)
Process materials	2011	2010	2011	2010	2011	2010	2011	2010
South Africa	3,913	4,575	5,529	6,685	66,800	75,896	46,014	57,275
Vaal River	3,027	3,612	2,720	3,274	66,223	75,317	43,709	55,006
West Wits	886	963	2,809	3,411	577	579	2,305	2,305
Continental Africa	13,831	12,797	28,037	26,653	10,600	2,170	81,425	51,483
Ghana
Iduapriem	1,594	1,594	7,640	6,466	489	304	4,101	3,345
Obuasi	3,888	3,562	-	-	1028	741	31,963	25,636
Guinea
Siguiri	2,993	1,550	1,373	841	1,930	84	19,554	10,899
Mali
Sadiola	1,860	2,143	825	7,925	6,961	698	5,710	7,741
Yatela	1,112	1,199	1,096	213	-	-	16,920	30
Namibia
Navachab	638	620	3248	995	20.7	16	188	300
Tanzania
Geita	1,746	2,471	13,856	10,213	171.2	327	2,992	3,532
Australasia	1,379	1,444	1,351	3,918	367	441	8,943	12,718
Australia
Sunrise Dam	1,379	1,444	1,351	3,918	367	441	8,943	12,718
Americas	4,795	4,531	28,417	27,458	1,829	1,994	129,709	139,268
Argentina
Cerro Vanguardia	444	480	5,978	6,755	1,259	1,359	2,482	2,167
Brazil
AGA Mineração	331	305	1,666	1,443	136	169	9,627	8,620
Serra Grande	544	558	1,485	1,629	25	23	1,664	1,295
USA
CC&V	3,476	3,188	19,288	17,631	409.21	443	115,937	115,937
Group	23,917	23,347	63,335	64,714	79,595	80,501	266,093	260,744

NR = Not reported

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EN2

The information below provides disclosure under the Global Reporting Initiative (GRI) indicator
EN2: Percentage of materials used that are recycled input materials.

Recycled input materials

As a gold mining company, AngloGold Ashanti produces gold, either as a bullion (typically 80-95% gold) or refined (99.5+%) bars, as well as silver and uranium as by-products. These are, by definition, original metal. Owing to the nature of mining, companies use manufactured products, such as steel, fossil fuels, chemicals and explosives, and natural resources, such as water, timber and mined rock, as well as electricity, to produce their commodities. There is therefore limited opportunity to substitute recycled or secondary materials on a meaningful scale, except where suppliers have already incorporated recycled materials into the product, for example, recycled steel into piping, liners and steel balls.

Consequently, measuring the extent of use of recycled input materials is not deemed meaningful.

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EN22

The information below provides disclosure under the Global Reporting Initiative (GRI) indicator
EN22: Total weight of waste by type and disposal method

Waste

Hazardous waste (2011)

Tonnes (unless noted otherwise)	Battery waste	Chemical and solvent waste	Fluorescent lighting waste	Hydro–carbon waste (m3)	Other hazardous waste
South Africa
Vaal River	5.8	9.7	4.5	64.6	17
				48
West Wits	54.92	–	3.2	34	16
Continental Africa
Ghana
Iduapriem	–	–	–	–	–
Obuasi	65	–	1.43	10,433	–
	7,064			6.66
Guinea
Siguiri	–	–	–	–	–
Mali
Sadiola	–	–	–	–	–
Yatela	–	–	–	145	171
Namibia
Navachab	NR	–	0.4	15.3	–
			–	59
Tanzania
Geita	–	–	–	605	0.74
					6.23
Australasia
Australia
Sunrise Dam	3.9	13	0.27	209.8	0.98
Americas
Argentina
Cerro Vanguardia	–	–	–	294.3	170.4
				452.1
Brazil
AGA Mineração	18.66	–	2.15	138.41	222.68
					20 376
Serra Grande	–	–	1.02	27.56	88.25
USA
CC&V	0.19	–	0.1	443.49	21.07

1. Note: Recycled
2. Offsite landfill
3. Onsite landfill
4. NR= Not reported

Non-hazardous waste (2011)

Tonnes (unless noted otherwise)	Ferrous metal waste	General waste	Non-ferrous metal waste
South Africa
Vaal River	5,519	26,535	295.9
		371.2
West Wits	4,941	4,554	275.7
		969.34
Continental Africa
Ghana
Iduapriem	–	–	–
Obuasi	685	31,119	44.3
Guinea
Siguiri	–	894.54	–
Mali
Sadiola	–	–	–
Yatela	–	1,152.13	–
Namibia
Navachab	193	4.2	–
		180
Tanzania
Geita	6,267	3,059	–
Australasia
Australia
Sunrise Dam	216.07	127	–
		19.16
Americas
Argentina
Cerro Vanguardia	233.8	127	–
	125.5	648.2
		631.7
Brazil
AGA Mineração	852.11	45.6	255.23
		398.7
Serra Grande	547.37	310.57	11.57
		77.78
USA	336.1	1,073.79	–
CC&V		1,375
		1.13

1. Note: Recycled
2. Offsite landfill
3. Onsite landfill
4. NR= Not reported

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MM3

MM3: The approach to the management of overburden, rock, tailings, and sludges, residues, including assessment of risks, structural stability of storage facilities, metal leaching potential, and hazardous properties

Total amounts of overburden, rock, tailings, and slimes and their associated risks

We were not able to collate this data in 2011. However, the masses of overburden, tailings, waste rock and sludges should be reported from the 2012 financial year. Various waste materials are produced during the mining cycle. Internal Tailings and Heap Leach Management Frameworks set the standard as well as provide guidance to which tailings and heap leach facilities must be constructed and operated. Internal geotechnical engineers are responsible for ensuring the structural stability of tailings, heap leach facilities and waste rock dumps.

During the design phase, appropriate handling and placement considerations have to be factored into the project design to ensure satisfactory protection of the environment and the safety of neighbouring communities. Risk assessments, environmental impact assessments, stakeholder engagement processes and other studies are used to identify appropriate mitigation measures and controls. During the operational phase, monitoring and audit processes are used to establish trends, identify emerging issues and to ensure conformance to the defined standard operating procedures and operating licence requirements for these various facilities, for example stability assessments, water quality and dust monitoring, hydrogeological and geochemical modelling etc., are carried out to monitor the effectiveness of the design and controls.

Closure considerations are generally defined at the design phase, continually revised throughout and finalised during the operational phase. These controls are then implemented during the closure phase (with appropriate post-closure monitoring).