Ore continuity describes how consistently a mineralized zone persists in grade, thickness, and geometry across an ore body, both laterally along strike and vertically with depth. High continuity allows geologists to confidently interpolate between widely spaced drill holes and design efficient, low-risk mining sequences, while poor continuity increases the risk of grade variability, unexpected waste intersections, and reconciliation discrepancies between predicted and actual mill feed. Continuity behavior differs markedly across commodities. Bauxite laterite blankets typically display strong lateral continuity over broad, flat-lying surfaces, making them relatively predictable to mine. Iron ore banded iron formations show continuity controlled by stratigraphic layering and structural folding, requiring detailed structural geology to track ore horizons through deformation. Gold deposits, particularly orogenic or epithermal vein systems, often exhibit discontinuous, lensoidal continuity with abrupt grade changes (commonly called nugget effect), demanding closer-spaced drilling and geostatistical modeling. Diamond-bearing kimberlite pipes have strong vertical continuity within the pipe boundary but highly erratic internal grade continuity due to the sparse, low-frequency distribution of diamonds themselves, which complicates reserve estimation considerably.
