CSCS Shot Firing common mistakes
CSCS Shot Firing · Understand the traps and how to avoid them.
Quoting generic safety slogans ("always follow the rules") instead of the specific statutory duty, regulation name, or approval body when asked who may store, transport, or fire explosives.
Candidates revise from memory of site inductions rather than the actual legal framework, so they cannot distinguish duties placed on the shot firer, the explosives supervisor, or the site operator.
What to do instead
Build a one-page duties matrix: for each activity (storage, transport, charging, firing, misfire handling) write the responsible role and the instrument that imposes the duty, then self-test by covering the role column.
Treating all explosives as interchangeable - describing a detonating cord, a shock tube, and an electric detonator as if they had the same initiation sensitivity, output, or hazard classification.
Candidates memorise product names without linking each to its initiation mechanism, output, and failure characteristics, so answers drift to whichever product they used most recently.
What to do instead
Create a comparison table with columns for initiation input, output, typical use, main failure mode, and storage/transport classification, and fill it from first principles for each product family.
Choosing an initiation system or circuit test method that does not match the hazard present (for example specifying an electric system near a radio transmitter or overhead power line, or testing a circuit with the wrong instrument).
Candidates learn systems in isolation and do not rehearse the selection step, so they default to the system they know rather than the one the environment permits.
What to do instead
Practise scenario cards: given a site condition (storm risk, nearby transmitter, conductive ground, long delay sequence), state the permitted system, the test method, and the reason the alternatives are excluded.
Designing a shot without stating the burden, spacing, or stemming length, or giving a powder factor with no units or basis.
Candidates describe the shot narratively and skip the numbers, or copy a figure without knowing whether it is per tonne or per cubic metre.
What to do instead
Answer every design question in a fixed template: hole diameter, depth, burden, spacing, stemming, explosive mass per hole, total mass, and powder factor with units, then check dimensional consistency.
Describing exclusion zone and misfire procedures in the wrong order or omitting a step - for example re-entering before the re-entry time, or not accounting for all detonators before recharging.
Procedures are recalled as a list of actions rather than a timed sequence with decision points, so steps get transposed under exam pressure.
What to do instead
Write the misfire and re-entry procedures as numbered flowcharts with the waiting period, who authorises re-entry, and the mandatory count reconciliation shown at each branch, then reproduce from memory.
Giving vibration, flyrock, or air overpressure answers as pass/fail opinions without naming the controlling variable or the measurement location.
Candidates conflate the predicted value at a sensitive receptor with the value at the site boundary, and do not link the control measure to the mechanism producing the effect.
What to do instead
For each environmental effect, state the mechanism, the controlling variables, where the limit applies, and one mitigation per variable; practise converting between charge weight, distance, and predicted level.
Listing record-keeping entries vaguely ("complete the paperwork") rather than naming the specific records - shot record, explosives reconciliation, misfire report, blast log - and who signs and retains each.
Candidates underestimate record keeping as an exam topic and rely on general site experience where records are completed by others.
What to do instead
Memorise a records register: record name, when created, who signs, retention period, and what it must contain; test by naming the record that would prove a given fact.
Describing communication as a single warning signal rather than a defined sequence with named roles, confirmation of clearance, and a distinct all-clear.
Candidates picture their own site's routine and omit the generic requirements - guarded approaches, positive acknowledgement, and the person authorised to give the all-clear.
What to do instead
Write out the full firing sequence as a timeline: guards posted, warning given, acknowledgements received, firing, post-blast inspection, all-clear; state the role responsible at each stage.
Answering competence questions by describing a training course attended rather than the evidence of competence - supervised experience, assessment, authorisation, and defined scope of duties.
Candidates equate attendance with competence and do not distinguish training, assessment, and authorisation as separate requirements.
What to do instead
Learn the chain training to assessment to authorisation to review, and for each role state what evidence demonstrates it and who may authorise it.
Ignoring the interaction between domains - for example answering a storage question without considering transport classification, or a design question without considering the exclusion zone it implies.
Revision is done domain by domain, so candidates answer the narrow question and miss the linked consequence the examiner is testing.
What to do instead
After each practice answer, add one sentence linking it to at least two other domains (e.g. design to exclusion zone to records), and review past answers for missing cross-links.