August 17, 2018
Over the last year we have held a number of technical breakfast-seminars on a range of topics, where we believe our approach is providing some thought-leadership. A varied group of stakeholders from the industry (consultants, miners, government authorities, brokers, drillers, etc) have been invited to attend our presentations and to contribute to the discussions. Topics presented so far include:
Hydrogeological Aspects of Reporting brine-hosted minerals within the JORC Code.
This was one of our more technical presentations, with the following key conclusions:
- Brine Resources are a complex Hydrogeological matter not a Geological matter.
- Draft JORC guidelines (developed in conjunction with AMEC) provide advice on what to consider for Brine Resources / Reserves; Canadian Standards (NI 43-101) prescribe how to consider it and are focussed on lithium brines specifically in closed basins.
- Resource Assessments: Presenting volumes based on porosity is optimistic (at best) and is discouraged. NI 43-101 clearly states that “the Specific Yield parameter should be used as the measure of the brine resource”.
- Reserve Assessments: Time dependent, with hydrogeological, engineering, economic and environmental modifying factors. Unlike any other mineral, as extraction starts the grade can change and resource volumes can be altered by recharge.
Ecohydrological Assessment Methodology
AQ2 and Equinox Environmental have developed a suite of tools (The Integrated Ecohydrological Model (IEM)) to quantify aspects of ecohydrological systems – including water source, tree-water stress and likely system response to hydrological change. The IEM includes a stochastic water balance model of the ecohydrological system and an innovative use of leaf-water-potential to determine tree water source and water stress (called the Ecohydrological Rehydration Index). AQ2 and Equinox have presented the methodology to Government Departments and received strong support. As a result, a number of assessments have been made for mining companies in WA, with excellent, quantifiable results.
Cost Effective & Schedule Efficient Approaches to Hydrogeological Data Collection during Mining Projects.
A wealth of hydrogeological data can be collected during early mineral exploration drilling. Collecting this data can results in cost and schedule savings and the early identification of potential Project risks related to groundwater management, allowing sufficient time to determine solutions. Most of this data collection required buy-in from the exploration drillers and geologists – for the hydrogeology data collection to be successful, it is likely that drilling contracts will need to reflect the data collection requirement.
February 14, 2017
AQ2 staff are currently assisting the Association of Mining & Exploration Companies (AMEC) as part of a Potash Working Group, developing draft guidelines for the Reserve Determination for Brine Resources. It is proposed that these guidelines would be linked to the JORC code. There is currently no guideline available for companies wishing to list on the ASX, while following the JORC code and companies are having to be guided by available international documentation, especially the NI 43-101 standard associated with the Canadian Institute of Mining (CIM). AQ2 are currently consulting on two potash projects where the CIM guidelines are being followed.
January 20, 2016
We like to think AQ2 has been a quiet achiever over the last year. Our team has grown and we have expanded our expertise in several new areas including stochastic water resources modelling, quantified ecohydrology and the application of mineral reporting codes, such as JORC, to solution-based mineral resources, such as potash and lithium brines.
We have settled in to our new, larger office in the centre of Perth city, making it far easier to meet up with our inner city and West Perth clients.
Our premises are in Perth CBD on William Street. Our new contact details are:
Level 4, 56 William Street, Perth, WA 6000.
Our telephone number is (08) 9322 9733.
December 18, 2014
Jeff Jolly (AQ2) was invited to chair the second day of presentations and discussion at The Water in Mining Summit, held in Perth 16-18 September 2014. He has provided a summary of the event.
Mining plays a major role in water use in WA (36% of all water is used by mining companies and 56% of all groundwater used is in mining) and interest in the Summit was good, with about 80 attendees from mining companies (BHPB, Newmont, Rio, Roy Hill, MMG, Anglogold Ashanti and Cameco), government departments (Department of Water WA, Department of Environment and Heritage Protection QLD, Bureau of Meteorology, CSIRO) and a number of consulting groups. Read more
August 19, 2014
Unconventional Gas in Western Australia
What is Unconventional Gas?
Natural gas is found in a number of different geological environments. As demand for gas has increased and drilling and extraction technology has improved, so exploration and production is moving into geological environments that were previously too challenging; gas in such locations is called Uncoventional Gas and it is often described based on the type of rock from which it is extracted (Figure 1), such as:
• coal seam gas (CSG) – found in coal seams,
• tight gas – found in compacted sandstone or limestone and
• shale gas – found in dense shale rock. Read more