4
The point cloud was processed using a Poisson-
Surface reconstruction approach, implemented in the
open-source software packages CloudCompare 2.13.2 and
MeshLab 2023.12, to generate triangular meshes. Quad-
meshes were generated based on the triangular meshes using
the software Rhinoceros 8 SR9 [13]. The generated meshes
serve as the underlying data for geomechanical and venti-
lation simulations. Further steps include the implementa-
tion of surfaces based on a B-spline approach (instead of
meshes) for a smoother representation of the very complex
surface of the mine walls, see, e.g., [14], [15]. Modeling the
geometry with B-splines additionally might result in a bet-
ter visualization experience of the digital twin when using
VR headsets.
The Geological Model
The poly-metallic “FLB Reiche Zeche” consists of vein-
type Ag-Pb-Zn mineralization hosted in Neoproterozoic
gneisses (Figure 4). The formation of the mineralization
is possibly related to the magmatic-hydrothermal activity
during the Permian [16].
The geological model is based on fieldwork carried out
in the proposed underground laboratory for the MOVIE
project. The dimensions of the drift and the chambers were
manually measured and mapped, and the resulting data can
be cross-checked with the point cloud of the geometrical
model. Fissure and joint measurements were made to deter-
mine their 3D orientation in the area. The structural data for
the joint and fissure system was integrated with the geomet-
rical model using the open-source 3D structural and prob-
abilistic geological modeling software GemPy 2024.2.0.2.
A cuboid with the dimensions 54 m x 10 m x 10 m was
selected as the generated boundary condition for the geo-
logical environment, in which the mapped section is cen-
trally placed.
The coupling between the geometrical and geologi-
cal model generates a 3D representation of the real situa-
tion, which serves to reinforce the final visualization. Using
this 3D representation, not only can geological formations
such as fissure systems be identified, but they can also be
Figure 3. Point cloud acquired with Z+F FlexScan 22 (subsampled to 1 cm point spacing). The
upper part shows the underground laboratory of the MOVIE project with its four chambers.
The lower part provides a detailed view of Cham-ber 1 [Clausthal University of Technology]
Figure 4. Reflected light microphotograph of the
mineralization at the “FLB Reiche Zeche,” showing some of
the main sulfides galena (gn), chalcopyrite (cpy), pyrite (py),
and arsenopyrite (asp) [Clausthal University of Technology]
The point cloud was processed using a Poisson-
Surface reconstruction approach, implemented in the
open-source software packages CloudCompare 2.13.2 and
MeshLab 2023.12, to generate triangular meshes. Quad-
meshes were generated based on the triangular meshes using
the software Rhinoceros 8 SR9 [13]. The generated meshes
serve as the underlying data for geomechanical and venti-
lation simulations. Further steps include the implementa-
tion of surfaces based on a B-spline approach (instead of
meshes) for a smoother representation of the very complex
surface of the mine walls, see, e.g., [14], [15]. Modeling the
geometry with B-splines additionally might result in a bet-
ter visualization experience of the digital twin when using
VR headsets.
The Geological Model
The poly-metallic “FLB Reiche Zeche” consists of vein-
type Ag-Pb-Zn mineralization hosted in Neoproterozoic
gneisses (Figure 4). The formation of the mineralization
is possibly related to the magmatic-hydrothermal activity
during the Permian [16].
The geological model is based on fieldwork carried out
in the proposed underground laboratory for the MOVIE
project. The dimensions of the drift and the chambers were
manually measured and mapped, and the resulting data can
be cross-checked with the point cloud of the geometrical
model. Fissure and joint measurements were made to deter-
mine their 3D orientation in the area. The structural data for
the joint and fissure system was integrated with the geomet-
rical model using the open-source 3D structural and prob-
abilistic geological modeling software GemPy 2024.2.0.2.
A cuboid with the dimensions 54 m x 10 m x 10 m was
selected as the generated boundary condition for the geo-
logical environment, in which the mapped section is cen-
trally placed.
The coupling between the geometrical and geologi-
cal model generates a 3D representation of the real situa-
tion, which serves to reinforce the final visualization. Using
this 3D representation, not only can geological formations
such as fissure systems be identified, but they can also be
Figure 3. Point cloud acquired with Z+F FlexScan 22 (subsampled to 1 cm point spacing). The
upper part shows the underground laboratory of the MOVIE project with its four chambers.
The lower part provides a detailed view of Cham-ber 1 [Clausthal University of Technology]
Figure 4. Reflected light microphotograph of the
mineralization at the “FLB Reiche Zeche,” showing some of
the main sulfides galena (gn), chalcopyrite (cpy), pyrite (py),
and arsenopyrite (asp) [Clausthal University of Technology]