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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

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compositing assays to the chosen bench height

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
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
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
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
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
we will go to minesight compass to create a sample composites file
We Will Go to MineSight® Compass to Create a Sample Composites File

Left click the projects


Left Click on Project

File Editor Icon

(the opening yellow


add our grade storage request
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 we have created a file we will put something in it with a compositing routine
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


it asks about areas to composite i can default on most things cause i want to composite everything
It Asks About Areas to Composite(I can default on most things cause I want to composite everything)

Click the forward

Arrow to move


it needs to know what grades to composite
It Needs to Know What Grades to Composite

I can use pull

Down menus

And pick off

What I want


Cu and Mo in

This case)

enter and tell it to move on
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)

gives me a compositing options screen
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)

lets admire our drill hole data ok your probably dying to know what kinds of grades you have
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


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 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
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
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
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


Selected ok

it wants to know where to get it s coordinates
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
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


I’m going to pick


it wants me to select the holes to display
It Wants Me to Select the Holes to Display

I do believe I will pick

An All option

lets load them up to view
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


now i can see my drill holes
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
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
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 pick set color by range
Now Pick “Set Color by Range”

We are going to pick separate colors for each grade interval

note we now see each grade of ore with a separate color
Note We Now See Each Grade of Ore With A Separate Color

We can


Around in

Our view to

See what

The drillholes


(We could also

Use our


To label holes

And grades)