The Fazenda Nova gold deposit (with an inferred resource of 650 koz at 4.0 g/t Au, cut-off grade of 2.0 g/t Au) consists of stockwork Au-As mineralization hosted in late Neoproterozoic dikes in the Goiás Magmatic Arc, central Brazil. The dikes, which host the mineralization, consist of a set of post-collisional ilmenite-bearing gabbros, dolerites, trachyandesite porphyry, trachyandesite, and trachyte porphyry (known as the Bacilândia Intrusions). U-Pb dating indicates at least two pulses of dike intrusions: the first pulse consists of small-volume dikes with ages varying from 593 ± 5 to 590 ± 5 Ma, and the second pulse comprises a large volume of dikes with ages from 574 ± 7 to 572 ± 5 Ma. Three veining or hydrothermal alteration stages are identified in the Fazenda Nova deposit. The first is the early or main stage, which comprises the pervasive biotitization of mafic minerals and a stockwork of quartz associated with a disseminated sulfide assemblage of arsenopyrite-pyrrhotite-stibnite, in addition to hydrothermal siderite, scheelite, rutile and apatite. The most common sulfide in this stage is a fine-grained, acicular arsenopyrite hosting inclusions of gold, galena and pyrite grains. The temperature estimated for acicular arsenopyrite, pyrrhotite and gold is 340 °C, based on the arsenopyrite geothermometry. The intermediate stage is represented by a stockwork of calcite-quartz veins associated with hydrothermal sericite, chlorite, tourmaline, epidote, and titanite, and a sulfide assemblage of pyrrhotite-arsenopyrite-pyrite. The arsenopyrite at this stage displays a tabular texture with no inclusions of sulfides or gold. The crystallization temperature of the tabular arsenopyrite-pyrite was estimated to be 305 °C. The C-O isotope data from the calcite veins of the second stage provided δ13C values ranging from −9.68 to −11.57‰, and δ18O values range from 12.87 to 13.84‰. These values are equivalent to those of hydrothermal mantle/magmatic carbonates. The late stage is represented by veining and brecciation infilled by monotonous calcite-ankerite with cockade and colloform vein textures and no gold mineralization.The dikes and gold mineralization present a strong relationship with the crustal-scale strike-slip Bacilândia Fault. This is a second-order crustal-scale fault that branches out of the major crustal-scale Moiporá-Novo Brazil Shear Zone (MNBSZ) along a NNW direction. The Bacilândia Fault played an important role in channeling melts and mineralizing hydrothermal fluids to the upper crust. The major activity of this fault occurred at ∼572 Ma with the emplacement of the second pulse of dikes and, most likely, the development of hydrothermal stages in the Fazenda Nova deposit. The collectively evidence allows Fazenda Nova to be classified as an epizonal, reduced intrusion-related deposit following that: i) the mineralization developed in a post-collisional tectonic setting above previously metasomatized subcontinental lithospheric mantle; ii) the dikes crystallized from metaluminous magmas with a primary oxidation state, which formed the ilmenite-series intrusions iii) the ore deposition had relatively high temperatures (340°–300 °C), and vein textures formed only at shallow depths (<4 km); iv) the metal association of Au-As-W-Sb; v) the volatile saturation induced by magmatic processes, such as fractional crystallization or magma mixing; vi) the CO2 hydrothermal veins with C-O isotopes displaying magmatic/mantle fluid affinities.