Materials

Materials are reported in two categories: raw materials, which is the ore from which we extract product, and associated process materials, which are used in processing but are not part of the final product.

Raw Materials

We extract ore, a non-renewable resource, from open pit and underground mines. This ore is either processed through a mill or placed on a heap leach pad to extract the product. In 2017, we processed 47.2 million tonnes (Mt) of ore, compared with 44.0 Mt in 2016.

2015 2016 2017

Amount of ore milled [t (metric)]

49,012,400

42,921,528

45,463,066

Amount of ore placed on leach pads [t (metric)]

3,038,400

1,106,445

1,779,387

Total amount of ore processed [t (metric)]

52,050,800

44,027,973

47,242,453

Associated Process Materials

To process ore and extract metals, our operations use certain materials and reagents such as lime and cyanide, as shown in the table below.

Associated Process Materials and Recycled Input Materials1

2015 2016 2017

Amount of ore placed on leach pads [t (metric)]

3,038,400

1,106,445

1,779,387

Cyanide consumption [t (metric)]

13,632

11,001

5,640

Lime consumption (in all forms) [t (metric)]

49,937

24,085

20,315

Sodium metabisulfite consumption [t (metric)]

6,225

5,200

1,861

Consumption of that reagent(s) [t (metric)]

63,437

89,839

50,067

Total reagent consumption [t (metric)]

133,231

130,125

77,883

Grinding ball consumption [t (metric)]

43,474

36,836

38,369

Recycled Input Materials

Recycled input materials used at our mines include mainly waste oil, used grinding balls and fly ash. These recycled materials are all sourced internally. Recycled input materials as a percentage of our total tracked input materials (excluding raw materials and fuel) was 7% in 2017. The quantity of used oil and used grinding balls input into our processes has increased significantly due to the Peñasquito mine’s program to reuse oil in the blasting procedure, as well as both Peñasquito and Cerro Negro’s practice of reusing grinding balls.

2015 2016 2017

Recycled glass consumption [t (metric)]

0

0

0

Fly ash consumption [t (metric)]

7,705

8,717

6,419

Recycled or reused oil consumption – converted to mass [t (metric)]

0

4

216

Used liner consumption [t (metric)]

0

0

0

Biosolids consumption [t (metric)]

164

94

0

Used grinding balls consumption [t (metric)]

0

0

2,424

Total recycled input materials consumed [t (metric)]

9,106

9,419

9,058

Total input materials [t (metric)]

185,811

176,380

125,310

Recycled input materials as percentage of total input materials [%]

4.9

5.3

7.2