Martin Rivera Email and Phone Number

Responsabilities:• In charge of the essential bidding processes of Compañía de Minas Buenaventura´s San Gabriel Project: Installation of concrete, Construction of structures & installation of piping, including mechanical works, Instrumentation & Electrical works for the process plant, Camp Services, and the Transportation and Logistics of the equipment to be imported and/or transported locally to the mine. • Responsible for the execution of each stage of the bidding process: from receipt of technical information, pre-qualification of bidders, queries, clarifications, shortlist, negotiation, resolution of commercial/contractual exceptions, issuance of letter of recommendation (LOR), notice to proceed (NTP) and issuance of the contract. • Preparation of the bidding process schedule (TES - Tender Enquiry Summary) ensuring compliance with each stage according to established dates.• Lead internal meetings (in English) with management and San Gabriel project´s manager at Ausenco and weekly meetings with Buenaventura to follow up on the status of bids and contracts under execution to solve queries or attend Buenaventura's requests. • Presentations to Buenaventura on specific requirements for each bidding package.• Submission of reports to management (progress of bids and contract status).Accomplishments:• Compliance with bidding schedule dates, avoiding conflicts with the project's critical path.• Reduction of commercial/contractual exceptions in the Camp Services bidding process: from 66 to 20, the remaining 20 were negotiated by finding a middle ground between the parties. • Keeping up to date with the responses to customer letters regarding requirements/claims of the contract and procurement packages (regularized the issuance of response letters to 50 customer letters).

Responsibilities: • In charge of bidding processes: negotiation of proposals and issuing letters of award according to company policies.• Management of all operation contracts (preparation of contracts, addendums, notices, etc.). • Claims resolution.• Supplier evaluation (search for new suppliers and database update).• Ensured contracting of services required for the reopening of Raura. This task was achieved by meeting previously assigned deadlines and closely coordinating with internal users and contractors. • Ensure compliance with the scope of work and schedules of contracted services.• Mapping of all our contract´s validity and status of ongoing bidding processes.• Presentation of management reports (reports on the progress of tenders, critical aspects, and contract status). Accomplishments:• Compliance with the contracting dates for critical services for the reopening of Raura (putting together packages of requirements to optimize the bidding time frame and achieve greater savings).• Improving contractor performance evaluations through biweekly (last quarter of 2021) and monthly (year 2022) meetings where discussions about improving: safety, environmental, and social management, among others, were held, agreeing on taking steps to achieve the requirements established by Raura.• Improvement in the outsourcing process through a detailed review of the Terms of Reference (scopes of work) to avoid conflicts in outsourcing aspects in contracts, coordinating with our Legal team, and disseminating the guidelines to all users.

Responsibilities:• Supervise contracts managed by EPCM Ausenco (EPCM in charge of executing the Mina Justa Project) regarding technical services until the cold commissioning of our Plant´s equipment.• Finalize and close negotiations for signing all Technical Service Agreements with local and foreign suppliers to start assistance for cold/hot commissioning and start-up of our plant´s equipment.• Enforce necessary actions to comply with the scope of work and schedules programmed for all technical assistance.• Oversee supplier performance, mitigating contractual risks.• Claims resolution.• Review and approve progress claims of suppliers, and follow up on paymentsAccomplishments:• Reduction from three to one month lapse on closing negotiations for the signing of Technical Service Agreements with local and foreign suppliers.• Standardization of Insurance Clause in all Technical Service Agreements.• Improvement on the negotiation status report regarding the signing of Technical Service Agreements: I included the meeting schedules with suppliers to review pending observations in the contracts and sign them.

Responsibilities: • Management of all operation contracts (preparation of contracts, addendums, notices, etc.). • In charge of bidding processes: negotiation of proposals and issuing letters of award according to company policies. RFQ/RFP analysis.• Claims resolution.• Supplier evaluation (search for new suppliers and database update).• Ensure compliance with the scope of work and schedules of contracted services and works.• Support our user areas, general management, legal management, and other administrative departments by answering their inquiries about contracts and service orders issued.• Mapping of all our contract´s validity and status of ongoing bidding processes.• Presentation of management reports (reports on the progress of tenders, critical aspects, and contract status).• Follow up on contractor’s payments by coordinating with our accounting and treasury departments. Accomplishments:• Standardization of contracts to avoid contractual risks. I included clauses such as a Letter of Credit for the performance of the service/work, a Letter of Credit for the warranty of the service/work, penalties, back charges, etc.• Savings: US$ 500K in 2018 through negotiations during bidding processes.• Claims resolution: Recovery of US$ 300K for the company.• Implement a template I designed to improve the terms of reference template (Scope of work template for bidding processes).

Responsibilities:• Management of operation and mine engineering contracts (US$ 50M).• In charge of bidding processes (operation and mine engineering departments), complying with the company´s policies.• Respond to purchase requisitions on time. Support our user department regarding inquiries about bidding processes and ongoing contracts. • Issue reports to the head of my department and our manager about the status of contracts and bidding processes.• Claims resolution.• Review and approve progress claims of suppliers, and follow up on payments.• Ensure compliance with the scope of work and schedules of contracted services and works.• Collaborate with internal audits.Accomplishments:• Savings: US$ 2 million through negotiations during bidding processes.• Implemented more thorough and explicit Terms of Reference templates that helped our user areas prepare these documents.• Improved the time response for purchase requests (Optimizing response time from 10 to 7 days).• Improved contract status reports by including budget tracking information.

Responsibilities:• Procure services required by Maritime Logistics, Safety, and Catering departments.• Responsible for RFQ and preparing the corresponding comparative charts of the quotations. Prepare and issue reports in English regarding proposal evaluations including hiring recommendations. • Support our managerial and administrative departments by answering their inquiries about contracts issued.Accomplishments:• Standardization of reports in English.• Improvement in the organization and custody of digital and hard copies of contracts.

Responsibilities:• Prepare proposals for our clients, coordinating with our headquarters office.• Supplier evaluation (search and evaluate new suppliers).• Onsite supervision of works.Accomplishments:• Better communication (in English) with our headquarters. The outcome was the awarding of three refrigeration systems for three fishing vessels.• Better evaluation of supplier’s performance by implementing a Supplier Performance Evaluation Format.• Extension of payment terms to our suppliers from 15 to 30 days.