This article discusses the principles, ethics, and obligations involved in tendering procedures for mining equipment. It covers pre-tender, tender documents, selecting tenderers, tendering, tender inquiries, amendment of the document, receipts and submission of tenders, evaluation of the tenders, negotiations and selection, and obligations of the tenderers. The article also includes information on the financial justification and financial arrangement, as well as contractual terms such as nature of the contract, service notice, assignment and subcontracting, statutory requirement, examination and testing, progress and programming of the work, suspension of works, delay of works, defects liability, variations, certificate and payment, default or insolvency, and termination.