SONAMINES
SOCIÉTÉ NATIONALE DES MINES
NATIONAL MINING CORPORATION
Head Office: P.O Box. 6388 Yaoundé
infos@sonamines.cm www.sonamines.cm
Omnisports, Avenue Marc Vivien FOE
+237 242 058 396
REPUBLIQUE DU CAMEROUN
REPUBLIC OF CAMEROON
CALL FOR EXPRESSIONS OF INTEREST 00003/ASMI/SONAMINES/DG/DPF/SMA OF 20 NOV 2025 FOR THE RECRUITMENT OF A CONSULTANT TO CARRY OUT A PRECISE GEOPHYSICAL STUDY ON 2 (TWO) BLOCKS OF 100 (ONE HUNDRED) HECTARES EACH CHOSEN ON THE GROUNDS OF OVERALL RECONNAISSANCE OVER THE SIKOUM EXPLORATION PERMIT.
FINANCING: SONAMINES' BUDGET, 2025 FINANCIAL YEAR AND FOLLOWING
1. BACKGROUND AND RATIONALE
As part of the achievement of exploration activities aimed for the mining of mineral substances, SONAMINES applied for and was granted the exploration permit named "Sikoum" valid for limestone by Order No. AR000165/A/MINMIDT/SG/DM/SDCM of 27 June 2023.
Subsequently, SONAMINES undertook to carry out several works, including subsurface core sampling, pitting, and a summary geophysical survey conducted in February 2023 by a consultant recruited for this purpose, over an area of 40 hectares, which in general, helped to confirm the presence of limestone formations.
However, the results obtained could hardly be correlated with the geophysical data available, based on the core sampling feedback, hence the need to carry out a precise geophysical survey to fine-tune the subsoil imaging and ease the understanding of the limestone resource.
In a bid to circumscribe the interest area of the permit, an overall reconnaissance campaign conducted from 5 to 15 March 2025, helped to define a surface area of $6\mathrm{km}^2$ for the conduct of future works. For the continuation of works, a precise geophysical survey was envisaged, thus the need to recruit a consultant.
The precise survey referred to above, which is planned to be carried out on two blocks of 100 hectares each, delineated in the aforementioned interest area, will help to have a better understanding of the geometry of the limestone deposit, and deepen the knowledge of the two blocks chosen, including the continuity, spatial distribution and extension of the limestone formations identified.
Ultimately, the results obtained will allow for a serene and precise planning of core samplings on this prospect highlighted after the reconnaissance phase.
2. PURPOSE
This Call for Expressions of Interest (CEI) aims to select a consultant to carry out a precise geophysics electrical survey that will help to have a better knowledge of the geometry of the limestone deposit, deepen the knowledge of the two blocks chosen, including the continuity, spatial distribution and extension of the limestone formations identified.
Specifically, the work will consist in:
- carrying out an electrical data collection campaign;
- carrying out the pre-treatment, treatment and interpretation of data collected;
- achieving a 2D and 3D mapping of the lateral and vertical breakdown of lithologic formations found at various depths;
- designing 2D and 3D geological models of ground images;
- making an estimate of the theoretical amounts of limestone;
- appraising the thickness, homogeneity and continuity of limestone layers on the blocks under survey;
- characterizing the waste rock;