August 27 (Coal Geology): Geological report is the final documentation of a study that contains all geological data collected during the field operations and reconnaissance stage. Many short projects do not even require any final report. Some projects require only a 1-2 pages long brief report. Some clients like to see maps and cross sections and reserve tables for coal tonnages only. Again, there are clients who expect extremely detailed report documenting every phase of the geological investigation.
So, the report preparation varies between different projects. The level of report preparation also depends on the scope of the study.
Before you start preparing a geological report, it is often helpful to organize your thoughts. I like to write down my table of contents first even before I start writing anything. Once I have the preliminary “table of contents” ready, I start thinking about the logical order for the items so that the transition from one context to another is as smooth and relevant as possible. Now, we are ready.
Geological reports for the coal exploration and reserve study are usually fairly large and include:
* Drilling Information: Driller’s logs
* Geophysical logs – Gamma Ray, Density Logs, Neutron Logs, Resistivity logs, acoustic televiewer logs etc.
* Survey details for all boreholes
* All geological maps – seam isopach maps, structure maps, overburden maps, roof and floor maps etc
* All geological cross-section showing the general geology and correlation of different geological units within the study area.
* Property maps
* Lease maps
* Coal Quality analysis
* Reserve tables
* Feasibility report
* Mine plan
* Probable Hydrologic impact due to mining
* And much more
The list is not anyway complete. Some projects require shaft and slope stability study, some projects require pre-mining study of the ground water seepage, packer testing, pre-grouting and lot more.
It is important that all data are incorporated within the geological report. All maps, cross-sections and tables should be easy to follow. Maps and cross-sections and the reserve tables are the most important parts of any coal reserve report. It is important to incorporate as much information as possible in the maps and cross-sections.
All geological reports should have a summary and conclusion part describing the most significant points of the project. Many times, “recommendation” follows the “conclusion” part of the report. For example, recommendation for addition drilling and borehole locations is very common for coal reserve reports.
A simple logical scheme may follow this:
- Geology (Aerial photo, basemap, regional geology, stratigraphy, structure, target seam geology, overburden, tectonics etc)
- Coal Quality (sampling results, sampling procedure)
- Coal reserve/resource tables (resource and reserve blocks etc, previous mining, active mining, feasibility, roof strength, geotechnical strengths etc)
- conclusions (and recommendations)
Any previous work within the study should be always acknowledged.
Note: Please feel free to comment about your experience with Coal Report Preparation.