SITE CHARACTERIZATION – PART 2 Building Solids Using the Horizons Method

Horizons Concept Boreholes with horizon IDs assigned to contacts Surfaces (TINs) interpolated from horizons Solids formed by extruding surfaces

Horizons Concept

Horizons Concept, cont.

1.Import boreholes (see previous slides) 2.Assign horizons to borehole contacts 3.Build primary TIN 4.Define cross-sections/horizon coverages (optional) 5.Build solids/HUF Basic Steps

 Can be imported with boreholes OR  Use Select Contact Tool  Double click on contacts or use Properties command in Edit menu  Contacts with horizon = 0 are ignored  Number horizons consistently  No limit to number of horizons 2. Assigning Horizons

 Auto Select Contacts/Segments Automated borehole tools

 Auto Assign Horizons Automated borehole tools

 Defines boundary of solid model  Controls level of detail on surfaces of solids  Steps:  Build polygon  Redistribute vertices  Map  TIN 3. Building the Primary TIN

5. Run Horizons  Solids Wizard Page 1 – Selecting the input data

5. Run Horizons  Solids Wizard Page 2 – Selecting the Primary Tin and Top/Bottom elevations

5. Run Horizons  Solids Wizard Page 3 – Interpolation Scheme and Solid options

Sample Application Boreholes Surfaces (TINs) Interpolated from Horizons Solids Cross-Section Cut Through Solids

4. Adding Cross-Sections  Allows greater control of interpolation, leads to improved results  Cross-sections are added between holes with horizon assignments  No limit to number of cross-sections  Horizon ids from boreholes are inherited by vertices of arcs on cross-sections

Inheriting Horizon IDs

Cross-Section Example Boreholes User- Defined Cross- Section Cross-Section Cut Through Solid Built from Boreholes Only Cross-Section Cut Through Solid Built from Boreholes and User-Defined Cross-Sections

 Horizon ID may be assigned to a TIN  User has the option to include TINs (or a folder of TINs) in the creation of Solids/Meshes with Horizons  Enhances user control over the interpolation process used by the Horizons algorithm TIN Horizons

 Allows the user to control the spatial extent of each horizon  User can assign a horizon ID to a coverage  When the solid/mesh for a given horizon is created using the conceptual model the solid/mesh will only exist where polygons have been defined in the associated coverage Horizons Conceptual Model