Big River Gold Limited present the results of the Dynamic Water Balance (DWB) studies completed by SRK Consulting (SRK) and the ongoing water management program to provide water security for the Borborema Gold Project (BGP or Project) providing the company with a potential to increase the plant throughput from that previously reported to the ASX on 23 December 2019 and 8 July 2020. Importantly, the DWB study has established water management plans for the Project that indicates minimal additional external water will be required to support a 2 million tonnes per annum (Mtpa) operation. Extending this model and given the rehabilitation of the Currais Novos sewage facilities is progressing well, water supplies available from Currais Novos are considered sufficient to support the expansion of plant throughput up to approximately 4Mtpa. The question of water management has also been addressed in conjunction with the DWB in the engineering design currently being undertaken for the Engineering Cost Estimate (ECE). This includes assessment of the water filtration from tailings, site wide drainage and water storage and various equipment options that better reduce water loss and increase water re-capture. A Dynamic Water Balance study for Borborema completed by SRK identified extended periods when no additional water is required from offsite to support a 2Mtpa operation. Sensitivity analyses of the model demonstrated that in average conditions an occasional peak shortfall of approximately 35m3/hour of process water may be required to be sourced from offsite to support a 2Mtpa plant. These short term demands occur in under 10% of the modelled climatic conditions based on analysis of the historical data by SRK. This equates approximately to a 1 in 10 year dry year1, the impact of which could be mitigated by several water conservation options and incorporation of the small Sao Francisco Dam into the Fines Dyke. These scenarios established that the most effective way of reducing any site process water deficit were: Delivery of sewage water from Currais Novos; Implementation of evaporation reduction methods, and Enlargement of the Fines Dyke storage capacity.