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San Antonio Quarry
METHODOLOGY FOR THE NET IMPACT ASSESSMENT OF
BIODIVERSITY.
June 2018
Quarry information
Location: Colombia, CountryBoyaca, StateSogamoso, Municipality
Average height above sea level: 2.600 – 3.000 meters
Average annual temperature: 12.5 °C
Average annual rainfall: 1059 mm
Area: 381.09 hectares
Coordinates: 5° 49’ 54’’ N 72° 59’ 57’’ O
San Andrés and Providencia Islands
GorgonaIsland
Geographical and time boundaries
< 1998
Quarry operated
with ED
1998
Quarry operated
with EMP
Baseline
Option C
(during quarrying status)
Quarry rehabilitation
20152001
Moment of Analysis
EMP modification
(during quarrying status)
Use of Proxy Information
1. Baseline: Information obtained from EMP 1998 and testimony of relevant experts
2. Moment of Analysis: Information obtained from the 2015 EMP modification
Evaluation habitats importance and condition (Baseline / 1998)
Natural Forest 126.53
Pastures and Crops Mosaic 9.50
Pastures 192.53
Plantation forest 0.00
Degraded lands 5.23
Rehabilitated area 0.00
Active extraction area 47.29
Total habitat area 381.09
Baseline
(1998)
during quarrying status
Area (ha)
A
2
1
1
2
1
2
1
Habitat
Importance
I
Maturity and
structure of
habitad
Likely diversity of
species typical for the
region and the habitat
Presence of
invasive
species
Degree of
threats to
the habitat
2 2 1 2 1.75
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
2 2 1 1 1.5
1 1 1 1 1
Condition
C
Habitat condition
442.8
9.5
192.5
0.0
5.2
0.0
47.3
697.4
Biodiversity
Value
(A*I*C)
1.8Biodiversity index
Evaluation habitats importance and condition (Moment of analysis / 2015)
Natural Forest 112.87
Pastures and Crops Mosaic 9.50
Pastures 5.65
Plantation forest 1 170.43
Degraded lands 5.23
Rehabilitated area 2 26.15
Active extraction area 51.25
Total habitat area 381.09
Moment of analysis
(2015)
during quarrying status
Area (ha)
A
2
1
1
2
1
2
1
Habitat
Importance
I
Maturity and
structure of
habitad
Likely diversity of
species typical for the
region and the habitat
Presence of
invasive
species
Degree of
threats to
the habitat
2 2 2 3 2.25
1 1 1 1 1
1 1 1 1 1
1 1 1 2 1.25
1 1 1 1 1
2 2 2 2 2
1 1 1 1 1
Habitat condition
Condition
C
507.9
9.5
5.6
426.1
5.2
104.6
51.3
1110.2
Biodiversity
Value
(A*I*C)
2.9Biodiversity index1 Habitat Importance 2, because it has become a refuge for different species2 Rehabilitated to natural forest
Net impact calculationBiodiversity index (moment of analysis) –
Biodiversity index (baseline)
2.9 – 1.8 = 1.1
Suggestions
o Expand glossary, for example, define maturity, habitat structure, diversity andtypical abundance as other ecological and biological concepts.
o Define or establish a scale or criterion that allows a better understanding ofthe value obtained in the calculation of Net Impact, especially when it ispositive.