5Nines sources South Australian-grown and malted Pilsner barley for its single malt expressions. After mashing and a seven-day fermentation, distillation occurs in the distillery's custom-built copper pot still. The Altar Cask was matured in a 100-litre French oak cask crafted by A. Stiller Coppers of Bethany, South Australia, previously used for Clare Valley Altar wine (Sacrificial Wine). The heavy char of the cask and the residual Altar wine impart dried fruit and vinous character. This expression is bottled at cask strength (64% ABV) with no water added, no chill filtration, and no fining agents — an extremely limited single-cask release.

5Nines Distilling is a small-batch single malt producer situated in the Adelaide Hills of South Australia, a cool-climate elevated region whose red clay soils and pronounced diurnal temperature variation suit spirit maturation. Founded in 2016 by David Pearse — a corporate IT architect — and Steven Griguol — a builder and sculptor — the distillery began in David's Adelaide Hills garage before relocating to larger premises on the Adelaide plains in late 2021, enabling seven-days-a-week production. Rather than purchasing equipment from a manufacturer, the pair designed and built their own copper pot still, retaining full control over distillation character. The distillery uses South Australian-grown and malted Pilsner barley across all its single malt expressions.