AMIRA

Question 1

Accountability

Answer 1

The ratio of the total output of a plant, or section of a plant, for a given material balance species (element or compound), to its total input, normally expressed as a percentage.

Question 2

Accounting Period

Answer 2

The period in which a company would normally report its financial results to the market. For example in the USA this is quarterly, while in many other financial markets the requirement is bi-annually.

Question 3

Accounting Standards

Answer 3

The financial accounting standards required by the relevant regulatory authorities including Stock Exchanges.

Question 4

Accuracy

Answer 4

A measurement is accurate if it, or the average of a number of measurements, is close to the true value. In metallurgical operations this true value is unknown. In addition, there is often misunderstanding between the terms accuracy and precision, which is the measure of the spread of a number of measurements around their mean value. For these reasons it has been decided to adopt the following definition for accuracy, which incorporates the concept of precision, and it is based on that given in ISO 3534-1:1993. A measurement that is accurate is one that is free of bias and it has a dispersion (standard deviation) that is lower than a defined dispersion or indeed a probability density of a particular nature. The level of dispersion or the nature of the probability density is defined with the purpose of separating measurements that are entirely fit for a particular purpose or use from those that are not

Question 5

Acid Mine (Rock) Drainage

Answer 5

The low pH effluent which seeps from waste rock, ore dumps or stockpiles of materials which have an insufficient capacity to neutralise the acidic products, containing the dissolution products of minerals

Question 6

Actual Recovery

Answer 6

The sum of all useful or desired outputs from a process, divided by the sum of all inputs to that process, expressed as a percentage.

Question 7

Analyte

Answer 7

A user-oriented quality requirement specifying the degree to which an application shall keep sufficient records to support a financial or technical audit

Question 8

What is rolling bottle test (used in heap leaching) ?

Answer 8

Simply said, a rolling bottle test consists of a bottle filled with known amounts of solid material and a liquid. The solid material can be either a naturally occurring material or a man-made product that is sized according to the needs of the test work. The liquid can have either an acid, neutral or basic pH and will typically contain a specific constituent intended to enhance the leaching. In the most basic case, neutral water is used as the leaching solution. The sealed bottle is then rolled on laboratory rolls for a specific period of time. The test leach period can be short or long. At designated time intervals and/or at the end of the leaching period the solution is sampled and analyzed for the constituents of interest. The final solid residue material can be assayed as well for the constituents of interest so that a mass balance can be formulated and an extraction can be calculated.

Question 9

Auditability is …. ?

Answer 9

Auditability - a user oriented quality requirement specifying the degree to which an application shall keep sufficient records to support a financial or technical audit

Question 10

Audit trails ….

Answer 10

In metal accounting, an audit trail is a sequence of paperwork/data entries that validates or invalidates metal accounting entries. Many metal accounting entries are based on those made to computers and the term could also be used for an electronic or paper log used to track computer activity.

Question 11

Barren Solution (Tails Solution) ….

Answer 11

Barren Solution (Tails Solution) – The discard solution from a metal ecovery process.

Question 12

Battery Limits ….

Answer 12

Battery Limits – The boundaries of a metal accounting system, across which all inputs to and outputs from that system are measured and balanced.

Question 13

Best Practical Means ……

Answer 13

Best Practical Means – The most precise method of performing a measurement taking into account the risk, degree of importance, cost and practicality for the stream and variable being measured.

Question 14

Best Practices

Answer 14

Best Practices – The most accurate method of performing a measurement with the information and equipment available at that time.

Question 15

Bias is …..

Answer 15

Bias – Bias is the difference between the mean result of one or more measurements
and the true value of the quantity being measured. It also can be seen as a consistent difference between two, or more, measuring systems. (e.g. sender’s and receiver’s weights, the analysis of the same sample by two laboratories etc.)

Question 16

Bubble Method is ….

Answer 16

Bubble Method – A method whereby the flow of material through a process plant is interrupted to allow for equipment to be emptied in series to facilitate stock-takes (normally applied to high value materials in the latter stages of processing).

Question 17

Bulk density is …..

Answer 17

Bulk Density – The density of a granular material normally stored in a bin, other container or stockpile, defined as the mass of the material divided by the volume occupied by the material (including the space between the particles).