The captured Quarry page provides only the upgrade-requirements table plus navigation, no descriptive text; by type and cost pattern it is the stone field. It becomes buildable at Keep 6 (rows Lv1-6 list Keep 6), then each level requires the matching Keep level (Keep n per Quarry n) -- Keep-gated, and unlike Farm/Sawmill/Mine it does not exist before Keep 6. Its upgrade cost is Food/Lumber/Ore -- the Stone column is blank (the stone field never costs stone). Ore enters at Lv12; late amounts large and balanced (Ore largest). Construction-speed example +0% through Lv17 to +610% at Lv50 (checkable in Administration on the monarch detail screen). No duty-officer or milestone section. For base_dev: Quarry is the stone source, first available at Keep 6, strictly Keep-gated so its level tracks the Keep, cheap early and extremely expensive late, consuming food/lumber/ore (never stone). No upkeep offset for stone is described (only food upkeep is documented), implying stone production is net-positive. Priority: raise only to the Keep minimum unless stockpiling stone for troop training that needs it (e.g. T2+ ground).
Original research source: Evony Guide Wiki