0002000775 2026-04-01 2026-04-01 0002000775 bkhau:UnitsEachConsistingOfOneOrdinaryShareAndOneFiftyOfOneRightMember 2026-04-01 2026-04-01 0002000775 bkhau:OrdinarySharesParValue0.0001PerShareMember 2026-04-01 2026-04-01 0002000775 bkhau:RightsEachRightEntitlingHolderToReceiveOneOrdinaryShareMember 2026-04-01 2026-04-01 false 0002000775 8-K 2026-04-01 Black Hawk Acquisition Corporation E9 001-41984 00-0000000 4125 Blackhawk Plaza Circle Suite 166 Danville CA 94506 (952) 217-4482 false false false false Units, each consisting of one ordinary share and one-fifth of one right BKHAU NASDAQ Ordinary shares, par value $0.0001 per share BKHA NASDAQ Rights, each right entitling the holder to receive one ordinary share BKHAR NASDAQ true false