English to Portuguese Tech/Engineering Mining & Minerals / Gems mine closure

Closure involves a lot of different financial calculations, depending on various international, national, and regional requirements. Some of these calculations include:

Provision that we hold on our balance sheet as a liability
Bank guarantees that we hold for governments (to cover closure costs if the parent company were to become bankrupt)
Cash cost for rehabilitation
Contingent liabilities that relate to uncertain risks that may have associated liabilities but are being investigated and not currently on the balance sheet