Summary

Deposit type

• Sediment-hosted

Summary:

Paleozoic through Tertiary rocks. The area is part of a corridor of northwest-southeast directed Tertiary extension in the Basin and Range province of Nevada. The study area is characterized by two north-trending uplifted blocks, the Bald Mountain-Buck Mountain Ridge on the west and Alligator Ridge on the east, separated by a fault valley that encompasses Mooney Basin, the Alligator Ridge deposits, and the Yankee and Vantage deposits.

The Bald Mountain Mining District falls along the southeastern extension of the Carlin trend (Nutt et al.2000). The district contains two separate but adjacent mineral trends: 1) the northwest-southeast Bida trend that parallels the Carlin trend; and 2) the Yankee-Alligator Ridge-Mooney Basin trend that follows the north-northeast trend of the structural basin between the Bald Mountain-Buck Mountain Ridge and Alligator Ridge. The geology of the district is quite complex and consists of a variety of reactivated folds and faults that serve to localize

Mining

• Truck & Shovel / Loader

Summary:

e known reserves. Bald Mountain includes several other deposits scattered over the property, and three ROM heap leach pads (Bald Mountain, Mooney and Vantage).

Bald Mountain mine is mined using standard open pit methods including drilling, blasting and loading into haul trucks. Typical bench heights are 25 to 40 feet high and of variable width. Overall pit wall slope angles range from 30 to 55 degrees. Blasted ore and waste rock are loaded into haul trucks by front-end loaders or electric and hydraulic shovels. Ore is hauled to the run-of-mine (ROM) leach pad.

Comminution

Crushers and Mills

Beneficiation

• ROM/dump leach
• Carbon in column (CIC)
• Carbon adsorption
• Cyanide (reagent)

Summary:

on is shipped off-site for further processing and ultimate gold refining.

The heap leach operations are divided into three areas: Bald, Mooney (North, South and Deep South), and Vantage. Vantage is the newest of the areas and became operational during the recertification period. The carbon-in-column (CIC) processing plants include: Process Plant 2, Mooney North Plant, Mooney South Plant, and the Vantage Plant. The Vantage Plant utilizes an innovative vertical CIC process. All operations noted here are within the North Operations Area (NOA) except for the Vantage Complex which is in the South Operations Area (SOA).

The Bald Mountain Mine Area includes:
• Process Area #1 which is no longer in operation. This consisted of a leach pad, five process ponds and a process building. The facilities have been decommissioned and the ponds backfilled. The area is currently under reclamation.
• Process Area #2 includes leach pads (Bald Leach Pad (previously pads 2 through 4) and Leach Pad 5), Pregnant Sump (PS1), Overflow Pond (POF1) and Secondary Pond (P4), two pregnant solution ponds (P5 and P6), Barren Pond (P7), Carbon-in-Column (CIC) process plant and cyanide offloading facility. However, the leach pads are not being actively leached; cyanide has not been added to the leach pads in over 12 months. The leach pads continue to drain down and the CIC process is still operational.

The Mooney Basin Area includes three process areas:
• North Area Facility, comprising a leach pad (Original Pad and Expansion Pads I, II, and III), two process solution ponds, a storm/event pond, Carbon-in-Column (CIC) process plant and cyanide off-loading facility;
• South Area Facility, comprising Leach Pad 4, a process solution pond, a storm/event pond, a solution collection tank, CIC plant and cyanide off-loading facility.
• Deep South Area Facility, comprising Leach Pads 5 and 6, a process solution pond, one storm/event pond, and a solution collection tank. Pregnant solution from this facility is piped to the South Area CIC plant for processing.

Originally, the Mooney North and Mooney South Area facilities operated independently. Pregnant and barren solution lines were constructed that connected these facilities, allowing solution to be pumped between them as needed.

The construction of the Vantage Complex began in Quarter 1 2018. The Vantage Complex is in the South Operations Area, was commissioned in 2019, and consists of:
• A leach pad, a solution collection tank, a process solution pond, a storm/event pond, CIC process plant, two cyanide storage tanks, and a cyanide off-loading area.

Water Supply

Summary:

er the life of mine.

In 2022, three out of the six operating mines (50%) were located in regions characterized by water stress, Tasiast in Mauritania, La Coipa in Chile and Bald Mountain in Nevada, USA. In keeping with the company-wide water balance accounting methodology, Kinross includes precipitation captured in our water withdrawn calculations. While precipitation is captured at all three sites, only the Bald Mountain (one out of three sites) withdraws and consumes fresh water from source (groundwater).

Bald Mountain, located in Nevada, U.S.A., is within an area categorized as arid and low water use Kinross’ criteria for assessing water risk supports this classification. Bald Mountain is a heap leach operation and maintains a high water recycle rate, achieving a rate of 93% in 2023.

Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
Health, Safety & Training Manager	Deanna Hall		Sep 13, 2024
VP and General Manager	Joseph Kemp		Sep 13, 2024