Electronic Publications
Updated 11 June 2023
Adobe discontinued support of Adobe Flash on 12 January 2021 and now blocks use of the Adobe Flash Player. I have therefore deleted all Internet based projects which rely on Adobe Flash Player. I am able to re-develop these projects to HTML5 format, but doing so is not a priority given my current commitments.
Cost in Use/Annual Equivalent Calculator

● Adobe Flash based (Xcelsius 2008)
● Annual Equivalent & Net Present Value with real escalation option for annual costs.
● Variable cycle durations.
● Table & chart with print panel.
● Save and compare scenarios within session.

Download EXE file with inbuilt Flash player here  (Download, do not play)
Discount Factors

● Adobe Flash based (Xcelsius 2008)
● Six fundamental discount factors.
● Dynamic charts with values to 6 decimal places.


Download EXE file with inbuilt Flash player here  (Download, do not play)



Dynamic Simulation Model - Recycling of Minerals in a Product
Exponential Decay in Rate of Mining Version 2.0 developed 24 May 2023

● Simple recycling of minerals model developed by Ivan M. Johnstone using Vensim.

● Download 10,000 year time frame version of model here

● Download PDF describing the model here
Dynamic Simulation Model - Recycling of Minerals in a Product
Linear Constant Rate of Mining Version 2.0 developed 24 May 2023

● Simple recycling of minerals model developed by Ivan M. Johnstone using Vensim.

● Download 10,000 year time frame version of model here

● Download PDF describing the model here
Dynamic Simulation Model - Recycling of Minerals in a Product
Hubbert Peak Production Rate of Mining Version 1.0 developed 4 June 2023

● Simple recycling of minerals model developed by Ivan M. Johnstone using Vensim.

● Use Excel file to establish additional symmetrical Hubbert Production Curves  Download here

● Download 10,000 year time frame version of model here

● Download PDF describing the model here
IN SEARCH OF STEADY STATE