1. SITE CHARACTERIZATION – PART 2 Building Solids Using the Horizons Method

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

3. Horizons Concept 1 1 1 1 1 1 2 2 33 3 3 3 444 4 44

4. Horizons Concept, cont.

5. 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

6.  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

7.  Auto Select Contacts/Segments Automated borehole tools

8.  Auto Assign Horizons Automated borehole tools

9.  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

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

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

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

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

14. 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

15. Inheriting Horizon IDs

16. 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

17.  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

18.  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