The　use　of　tailings　sand　for　CO2　mineralization　and　utilization　(CMU)　has　been　emerging　globally,　offering　a　sustainable　solution　for　repurposing　tailings　sand　while　establishing　a　stable　carbon　sink.　Despite　several　reports　that　evaluated　process　performance　and　project　benefits,　existing　research　has　not　delved　into　the　project　layout　focusing　on　the　tailings　pond　facility　and　the　feasibility　considerations　from　a　cluster　and　ownership　perspective.　Conducting　facility-scale　refined　mineralized　carbon　sink　(MCS)　and　layout　feasibility　assessment　is　a　key　issue　that　needs　to　be　addressed　urgently.　Here,　we　accounted　for　CMU　potential　(CMUP)　of　tailings　sand　using　a　sample　of　6219　tailings　pond　ownerships　in　China,　predicted　future　annual　carbon　sinks　through　an　innovative　ARIMA-cloud　model,　and　analyzed　the　feasibility　of　project　layouts　within　potential　clusters　concerning　enterprise　size.　Our　results　indicate　that　the　CMUP　of　accumulated　tailings　sand　in　China　amounts　to　1817.87　Mt.　In　a　combined　scenario　involving　future　technological　leapfrogging　and　increased　utilization,　the　average　annual　carbon　sink　by　2030　is　projected　to　be　24.73　Mt.　A　considerable　reduction　in　project　layout　feasibility　across　all　scenarios　was　observed　due　to　the　mismatch　between　carbon　clusters　and　enterprise　size.　Our　study　reveals　that　CMU　using　tailings　sand　should　be　regarded　as　one　of　the　essential　green　technologies　in　the　portfolio　of　strategic　Chinese　CO2　mitigation.　However,　we　highlight　the　necessity　of　aligning　cluster　programs　with　the　support　capacity　of　the　ownership　enterprise　to　ensure　the　optimal　project　success.