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RESERVE ESTIMATION TECHNIQUES

front 1

back 1

- used in single vein-type deposits
(e.g. gold-bearing quartz veins)
- channel & chip sampling was
conducted at 3-6 ft intervals along
the openings (drives, winzes, raises)

front 2

Tonnage (Old Style)

back 2

(area block)(thickness vein)(S.G.)

front 3

Delaunay Triangulation

back 3

Triangular Method

front 4

Tonnage (Triangular Method)

back 4

Volume=(area-triangle)(thickness)
Tonnage=(Volume)(S.G.)

front 5

back 5

Area of Triangle

front 6

Square/Rectangle Method

back 6

for flat type/near surface
deposits (bauxite,laterite)
- drill holes are at the centers

front 7

Polygonal Method

back 7

for flat type/near surface deposits
(bauxite,laterite)
- perpendicular bisectors are drawn
between every drill hole; areas are
planimetered/calculated

front 8

Contour/Isopach/Isograde Method

back 8

- for flat type, low-dipping disseminated
deposits

front 9

Isolines

back 9

constructed by interpolation
between points of known values
that assume a gradual
uninterrupted change from one
point to another

front 10

Isopachs

back 10

thickness of contours

front 11

Cross-Section Method

back 11

estimates a block of ground that is
bounded between regularly spaced
sections

front 12

Random Stratified Grid (RSG) Method

back 12

regular grid of a suitable size and an
orientation is adjusted on a set of drill
holes
- trial and error; until, at least one
sample value falls per grid panel.

front 13

Longitudinal Vertical Section (LVS) Method

back 13

divided into subblocks

front 14

Regionalized variable” theory

back 14

spatial relationships
between sample values, thickness, or any geological phenomena
showing intrinsic dispersion

front 15

theory of regionalized variables states that

back 15

t natural phenomena
are characterized by a distribution in space of one or more variables

front 16

Geostatistics

back 16

for mapping of surfaces from limited sample data and the
estimation of values at unsampled locations

front 17

Semivariance

back 17

Used to express the degree of relationship between the
points on a surface

front 18

Kriging

back 18

Named after D.G. Krige
- an optimal spatial interpolation technique that uses the
semivariogram in calculating estimates of the surface at grid
nodes

front 19

Simple Kriging

back 19

- there is an assumption that the mean is both constant and known (making it the most restricted form of kriging

front 20

Ordinary Kriging

back 20

applicable to samples with constant, but unknown
mean (no trend)
- most general and widely used