PT Delta Dunia Makmur Tbk Delta Dunia Group DOID future-facing commodities akuisisi Perpanjangan Kontrak Operasional Whitehaven Coal Mining Limited Blackwater Operations Pty Ltd Saham Tambang Blackwater Australia Atlantic Carbon Group Inc. (ACG) produksi baja rendah karbon komoditi aksi korporasi kinerja perusahaan EBITDA