Centerra Gold Inc.

Sample Preparation, Analysis and Data Verification

From 2007 to 2012, samples from the Öksüt Mine were sent to ALS Chemex in Izmir, Türkiye with the actual analyses conducted in the ALS Chemex facility in Vancouver, Canada or Roşia Montanӑ, Romania and finally, in Izmir. From September 2012 onwards, preparation and analysis of samples were carried out by SGS Ankara, Türkiye. Gold was assayed using standard 50 gram fire assay with an atomic absorption (AA) finish, and other elements were determined by multi-acid digestion and inductively coupled plasma (ICP) finish. Both laboratories are independent ISO 9001:2008 registered external commercial assay laboratories.

Until early 2013, quality control measures consisted of the routine insertion of prepared standards, blanks and duplicate samples at a rate of three standards, one blank and one duplicate per 100 samples. From 2013, the insertion rates one

2023 Annual Information Form Page 45 standard per 30 samples and one blank and one duplicate per 50 samples. In addition, routine duplicate assays of pulps were undertaken as part of laboratory QC protocols.

A protocol was initiated in 2012 to send 5% of all assayed sample pulps to a second laboratory for analysis. Acme Labs (now Bureau Veritas), Ankara, Türkiye, was selected to provide external check assays.

In May 2013, an audit of the SGS Ankara laboratory and QAQC procedures was conducted by Lynda Bloom of Analytical Solutions Laboratory (“ASL”). Based on the review of QC data and a site visit to the Öksüt Mine, ASL considered that “there is no evidence of bias within the current database (at May 2013) which would materially impact a mineral resource estimate”. Drill samples continued to be dispatched to SGS in Ankara during 2014, and then again for 2018, 2019, 2021 and 2022. During 2015, 2017 and 2020, drill samples were dispatched to ASL in Izmir. During 2022 and 2023, the same QAQC procedures were followed as described in the 2012 protocol. In 2022, 5% of the assays that had a direct impact on mineral resource and mineral reserve estimations were dispatched to the ASL lab as check assays. No check assays work was carried out in 2023.