Proprietary Research · Mining Sector Intelligence

Mining is
Recovering

We read 4.2 million sentences from 86,000 SEC filings using 22 ML classifiers. COVID hit mining harder than any sector. The recovery has been slow but real.

March 2026 · 4.2M sentences analyzed · Biotech Alpha Analytics

The Scale of the Problem

Mining is one of the most data-rich sectors in SEC filings. Exploration updates, drill results, resource estimates, permit milestones — all buried in dense technical language. We built classifiers to extract the signal.

4.2M
Sentences analyzed
(2018–2026)
86K
SEC filings
(10-K and 10-Q)
283
Mining companies
(SIC 1000–1499)

We built 22 ML classifiers — 10 mining-specific (drill results, resource estimates, permits) plus 12 general business classifiers (revenue, expectations, risk factors).

Raw scores are noisy. A 10-K always scores higher than a 10-Q. Commodity cycles create seasonality. To find real signals, we compare each quarter to its recent history using a rolling z-score.

The solution: Compare each quarter to its own recent history. Above +2σ = breakout. Below -2σ = breakdown. These are rare events (<5% of quarters).

22 Classifiers Tell the Story

We combine 14 positive classifiers (discoveries, resources, permits, growth) and 8 negative classifiers (pressure, decline, risk) into a single sector health score.

14
Positive classifiers
(discovery, growth)
8
Negative classifiers
(pressure, decline)
±2σ
Breakout threshold
(top/bottom 2.5%)
Mining Sector Z-Score: COVID Crash and Commodity Recovery
Z-score measures how far the current quarter deviates from the rolling 8-quarter average. Gray band = normal range. Outside ±2σ = statistically significant signal.
The COVID shock was historic. Q1 2020 hit -4.7σ — nearly five standard deviations below normal. That's a statistical anomaly that should happen less than once in 100,000 quarters. Mining companies went into crisis mode simultaneously.

The Four Signals Since 2020

Q1 2020: COVID Shock
-4.7σ — The most extreme breakdown in our dataset. Operations halted, exploration paused, financing dried up. 2,993 filings all telling the same story.
Q2 2020: Continued Crisis
-3.1σ — Still deeply negative. Companies scrambling to preserve cash, cut costs, and survive the commodity price collapse.
Q3 2020: Trough
-2.6σ — The worst raw scores but z-score improving. The bottom was in. Companies beginning to discuss recovery plans.
Q2 2023: Commodity Boom
+3.3σ — First breakout since COVID. Gold, copper, lithium prices surging. Exploration activity ramping up. Resource estimates improving.
Current Status (Q4 2025): Z-score at +1.6σ — positive but within normal range. The sector has stabilized. Not a breakout, but consistently above zero for the past year.

How We Built This

This analysis required processing 4.2 million sentences from 86,000 SEC filings. Each sentence was evaluated by 22 ML classifiers. We aggregated by quarter and applied rolling z-score normalization to reveal statistically significant events.

86,000 SEC filings
→
4.2M sentences
→
22 ML classifiers
→
Rolling Z-Score
→
Breakout signals
Z-Score = (Current − Rolling 8Q Average) ÷ Std Dev
Compares each quarter to its recent history. Above ±2σ = statistically rare event (<5% of quarters).

The 22 Classifiers

We combine 10 mining-specific classifiers with 4 general positive and 8 general negative classifiers:

Mining Positive (10)
acquisition_of_claims, drill_intercept_significant, drill_results_positive, jv_or_option_agreement, maiden_resource_estimate, new_zone_discovered, ni_43_101_filed, pea_or_pfs_positive, permit_approved, permitting_milestone_achieved
General Negative (8)
revenue_declining, below_expectations, cost_cutting, going_concern_warning, financing_desperation, supply_chain_issue, regulatory_setback, negative_outcome
General Positive (4)
revenue_growing, above_expectations, positive_outcome, market_expansion

Key Takeaways

  • 1 COVID was a 5-sigma event. Q1 2020 (-4.7σ) was the most extreme breakdown in our dataset — a statistical anomaly of historic proportions.
  • 2 Recovery took three years. Mining didn't see a breakout until Q2 2023, when commodity prices finally surged and exploration activity resumed.
  • 3 The sector has stabilized. Since Q2 2023, z-scores have remained positive but within normal range. The crisis is over, but not a boom.
  • 4 Mining-specific classifiers matter. Drill results, resource estimates, and permit milestones are the language of mining. Generic classifiers miss the signal.