Compositing Assays To The Chosen Bench Height ©2007 Dr. B.C. Paul {Note – The Name MineSight® and the Program described are property of Mintec Inc – Tucson, Arizona}

Where Does This All Fit With Raw Assay Data and Topography we represent our deposit as a series of blocks We use Interpolation Techniques to Predict Block Grades and Properties from Drill Hole Data A Model that gives average geologic properties for blocks of earth is a geologic block model

What Will We Do With It We use our economic data to assign a $ value to each block of ground We then have a computer routine dig us the biggest set of blocks that makes us the largest profit  This set of blocks is our ultimate pit  For planning purposes we will decide how to expand the pit out to those limits

What Do We Have We have a digital representation of our surface We have a file that contains all our core hole assays and their locations

What Will We Do First? We need to composite our drill hole assays over our bench heights  Typical open pit techniques have little ability to selectively mine over a bench height  Need our interpolatable data in a similar form to what we will need (ie our geologic block model) A File 9 stores drill holes that have been composited to the height of our mining bench – We will create that File 9

Go to the MineSight Heading and Left Click to Pull Down the Menu Left click on Compass

We Will Go to MineSight® Compass to Create a Sample Composites File Left click the projects Tab Left Click on Project File Editor Icon (the opening yellow Folder)

Under File / New I Will Pick a File 9 which is an unsorted composite file

Add Our Grade Storage Request Purple Fields show Reference items that Minesight will include By default. To these I want to add Cu and Mo (Note it is also important To set the minimum And maximum range A precision of the data We will composite)

Now Save It To The Project File

Send it to Eurk9.dat (Or what ever else you name it – 4 characters the number 9 and a.dat)

Our Program Proclaims Its Success

A Quick Check of the Files Confirms it is There!

Now We Have Created a File we will put something in it with a compositing routine On the menu tab we Will ask it to show us Compositing programs We will look down the List and pick bench compositing

It Asks About Areas to Composite (I can default on most things cause I want to composite everything) Click the forward Arrow to move on

It Needs to Know What Grades to Composite I can use pull Down menus And pick off What I want (obviously Cu and Mo in This case)

Enter and Tell it to Move On I did tell it to put Its reports in an Rpt file (which is What it did with Other reports)

Get a Page of Compositing Options That don’t apply to me right now Move on

Gives Me a Compositing Options Screen The default is by Bench height but Using bench Height for the Composite interval Only works for Vertical holes (has a bunch of Options for handling Non-vertical holes) Since our holes are all vertical we will default and move on

Asks if we want to use any special weighting system for our assay averages (the default is to just weight by length of the sample) That’s good for us (since we have no special weight differences)

If it Finds Anything that Seemed Irregular it will warn you so you can look at the reports

Lets Admire Our Drill Hole Data (Ok your probably dying to know what kinds of grades you have) We will start by Creating a drill hole View Go to File to pull down A menu Select new to pop out A side menu Select Drillhole View A menu with one Choice pops out Take it

It Wants You To Give It A Name

It Needs a File to Tell it What Area to Draw a Picture Of (The natural choice is to pick the project control file that has our view limits)

Now I Get A Choice of Project Control Files (of which I only have one) Note that it is very Handy to know what Kind of data is stored In different file types a file 10 is a project Control file

I Can Choose Either to Look at My Original Assay File or My Composite File A file 9 is a composite A file 11 is an assay (the selection is Made by left clicking The appropriate Radio button)

You Need to Left Click on the Assay and Survey Files to Use Once selected They will turn Blue and the Ok button Turns dark – Meaning it can Be selected (when its grayed Out it is not Selectable) Selected ok

It Wants to Know Where to Get It’s Coordinates The Survey File Seems a fine choice To me. Left Click Ok to Move on.

It Wants to Know If I Want to Limit What Can be Displayed You can make Things run more Lean+mean by Keeping down Which variables Can be displayed But this also limits Choices. I’m going to pick No.

It Wants Me to Select the Holes to Display I do believe I will pick An All option

Lets Load Them Up to View After making my Selection I will Direct it to load The holes I will then ok or Apply the Selection.

Now I Can See My Drill Holes!! I’d be even more Excited if I could See more than Gray lines.

Lets Enhance that Ugly Gray Display On the drillhole View properties Click Cut-off This brings up Some ranges I Can set color Graphics for.

Lets Put in Our Cut-Off Grades Start at the top and Type in the top of each Grade range Use the down arrow On your keyboard to Move down to the next I used 0 to 0.15 waste.15 to.31 Leach.31 to.9 Regular Mill.9 to 5.2 High Grade

Now Highlight Our Grade Range Click on Properties

Now Pick “Set Color by Range” We are going to pick separate colors for each grade interval

Set it to go from Blue for Low Grade to Red for High

Note We Now See Each Grade of Ore With A Separate Color We can Explore Around in Our view to See what The drillholes Have. (We could also Use our Procedures To label holes And grades)