From Prospecting to Post-Closure: Geotechnics as a Continuous Line, Not as a Point-in-Time Project

In much of the global mining industry, geotechnical engineering is still used as a "quick response" service to expedite decisions that have already been made in practice by other areas. Urgent analysis to meet regulatory requirements, reports to justify dam raising, opinions to authorize production after critical inspections, dam break reports for specific licensing. Each demand generates an isolated "project," with a limited scope, short timeframe, and little connection to the structure's history or the asset's long-term plan.

This model was sufficient for a long time in an environment with less scrutiny. Today it is structurally insufficient. Containment structures, waste rock piles, pits, buffer piles, tailings dams, and filtered deposits are high-risk assets with a horizon of decades. They go through price cycles, changes in legislation, team successions, corporate restructurings, and an increasingly demanding ESG environment. When these structures are treated as technical “episodes,” instead of as a continuous line of risk and performance management, the company accumulates liabilities, loses capital efficiency, and weakens its social and regulatory license.

This article proposes a repositioning of geotechnics within mining, based on a lifecycle framework, from conception to post-closure, and discusses how this change alters the way risk is decided, measured, and communicated. In this context, VinQ positions itself as a lifecycle partner, focusing on technical governance and continuity, not just as a provider of one-off studies.

The structural error of treating geotechnics as a "design" process.

When geotechnical engineering is managed as a portfolio of independent projects, three distortions repeatedly arise.

The first is the fragmentation of the geotechnical model. Each report consolidates a partial snapshot of reality. Laboratory tests from different campaigns are not integrated into a single parameter framework, stability analyses use different criteria for similar loading states, and dam break studies consider rupture and hydrology scenarios without alignment between structures. The result is a set of pieces that are technically defensible in isolation, but which do not compose a "living model" of the behavior of structures over time.

The second is the loss of coherence between design, execution, operation, and monitoring. A project may have been conceived with robust criteria, but the technological control of the implementation was not structured to guarantee adherence, the inspection routines were designed focusing on minimum compliance, and the instrumentation was specified without a clear link to design assumptions. Years later, when deformations, settlements, or atypical pore pressure patterns appear, there is a missing connecting thread that allows linking the structure's response to what was designed, built, and operated.

The third is the asymmetry between prevention and correction. Geotechnical budgets become dominated by corrective CAPEX, the use of contingencies, and emergency mobilizations. Slope reinforcements, drain reconstructions, redesigned embankments under tight deadlines, and the reactive implementation of advanced monitoring systems after critical audits. The company spends more, assumes more reputational risk, and yet feels that it is "never ahead" of regulatory and stakeholder requirements.

This pattern translates into a fragile narrative in the eyes of regulators, investors, and communities. Externally, the company always seems to react: it responds to recommendations late, presents ad hoc studies instead of multi-year plans, and treats regulatory changes as a shock rather than an expected trajectory. Internally, geotechnics is perceived as an unpredictable cost center, associated with production constraints, interruptions, and "unpleasant surprises."

In short, treating geotechnics as a project is applying transactional logic to systemic risk assets. It's not about doing bad studies. It's about doing good studies without a lifecycle architecture connecting them.

A life cycle framework for geotechnical structures

A more robust approach is to treat geotechnical structures as full-lifecycle assets, in line with asset management practices, but with the technical depth that the subject demands. This framework organizes decisions and data across six macro-stages: conception, design, implementation, operation, closure, and post-closure.

In the design phase, the focus is on deciding where and how to build, with a horizon of decades, not just on one-off permits. Geotechnical engineering should be involved in the discussion of typology, site alternatives, and territorial integration, not only to "make the project viable" but also to compare risk portfolios. This phase assesses structural geology, regional hydrogeology, geomorphological context, the presence of pre-existing structures, downstream occupation, flood routes, and compatibility with closure strategies and future land use. A typology and location choice based solely on initial CAPEX typically transfers risk and cost to the future.

In the design phase, conceptual decisions are transformed into performance criteria and explicit assumptions. Stability envelopes are defined for drained and undrained states, extreme loading scenarios, allowable deformation criteria, representative strength and stiffness parameters with quantified uncertainty, internal and surface drainage strategies, minimum instrumentation requirements, and expected performance in closure scenarios. This is the time to align national standards, international guidelines, and the company's risk appetite into a coherent set of criteria.

During implementation, the focus shifts to control and traceability. This is where decisions are made regarding whether the structure will have a usable "construction memory" or if its history will be a black box. Technological control procedures, sampling plans, compaction records, water level monitoring and drain performance, management of design deviations, and documentation of field decisions need to be structured so that, years from now, it will be possible to understand why the structure behaves as it does.

During operation, geotechnical engineering must operate with a dynamic risk management logic. Instrumentation data is interpreted in light of the geotechnical model. Periodic reviews recalibrate parameters and safety factors based on field evidence. Relevant operational changes undergo a formal geotechnical change management process, with impact assessment and clear acceptance criteria. Interaction with mine planning, environment, and water resources becomes routine, not the exception.

In the closure phase, the objective is to transition from an operational asset to a long-term liability with controlled risk. This involves reshaping geometries for permanent stability, designing drainage systems that require minimal active maintenance, specifying erosion control and mitigation techniques compatible with future climate and use, and defining performance indicators that will be monitored in the post-closure phase. Here, the quality of decisions made decades earlier is measured.

In the post-closure phase, the central question shifts from "how much to produce safely" to "how to maintain a stable and socially acceptable structure with minimal effort and maximum traceability." Monitoring programs are simplified but maintain a focus on key parameters. Inspection and response protocols are redefined for a less interventionist environment. The company needs to be able to demonstrate to regulators and society that the structures were not only decommissioned but are managed responsibly over time.

Throughout all these stages, what provides consistency is the continuity of the geotechnical model, the coherence of the performance criteria, the integration with other critical processes, and the clarity of roles. Without this continuous line, any local gain is easily lost in the transition between phases.

High-impact decisions that require geotechnical expertise from the outset.

A few decisions, made in the early years of a project, concentrate most of the geotechnical risk and cost of the life cycle. If geotechnical engineering is involved late in making these choices, the company essentially "locks in" liabilities that are difficult to mitigate.

The choice of tailings disposal typology is one of these decisions. Opting for valley dams, drained stockpiling, filtered tailings, co-disposal, or hybrid combinations is not a purely technological decision. Each typology implies different predominant failure modes, distinct levels of sensitivity to water, specific monitoring requirements, different degrees of exposure in case of rupture, and varying margins of maneuver in terms of closure. A structured analysis needs to compare risk and cost scenarios, not just the initial CAPEX of the system.

The selection of geotechnical structure locations is another example. Deciding which valley to build a dam in, which plateau will receive a tailings pile, or where a stockpile or storage yard will be located determines the interaction with geotechnical units, pre-existing structures, natural drainage routes, and communities. A decision made based solely on short-term operational criteria often ends up requiring expensive and complex reinforcements, drainage diversions, and mitigation solutions in the future.

Water criteria, such as how the allowable water balance is defined, operating levels, internal and surface drainage philosophy, and the relationship between geotechnical structures and catchment and recirculation systems, account for a significant portion of instability events. Poorly structured decisions regarding water accumulation in reservoirs, tailings pile drainage, contact water management, and interception of natural drainages tend to translate, some years later, into high pore pressures, internal erosion, piping, unwanted settlements, erosive processes, drain clogging, and the need for corrective works.

The decision regarding the monitoring architecture is equally critical. Adopting advanced instrumentation, such as vibrating wire piezometers, inclinometers, robotic total stations, and InSAR, without linking it to design assumptions, response plans, and defined responsibilities, creates data silos that generate more noise than insight. The central question is not just "what to measure," but "how to transform measurements into decisions." This requires that the design of the monitoring system be an integral part of geotechnical reasoning from the conception stage.

In all these decisions, the central point is timing. When geotechnical engineering is involved early, with robust tools for scenario analysis, probabilistic evaluation, sensitivity studies, and systematic comparison of alternatives, the company shifts the risk curve downwards. When it is involved late, geotechnical engineering begins to operate as a mitigator of consequences, and not as a designer of trajectories.

Structuring the geotechnical "product line" within the mining company.

Treating geotechnics as a continuous line implies structuring it as a true internal "product line," with a clear owner, defined governance, standardized routines, and indicators that connect technical effort to business results.

Governance begins with defining a lifecycle "owner" for geotechnical structures. This is not merely a functional manager, but an entity with a mandate to consolidate the corporate geotechnical model, prioritize the risk and project portfolio, bridge the gap between recommendations from independent audits and internal action plans, integrate geotechnics with mine planning, environment, water resources, and finance, and technically represent the company before regulators and boards.

In terms of processes, the mining company needs to move from an "on-demand studies" agenda to one of recurring routines. This includes periodic geotechnical risk forums by structure, with systematic review of stability and drainage indicators, parameter update cycles based on new investigations and back-analysis, formal reviews of safety factors for critical loading states at predefined height or production milestones, structured change management processes with mandatory geotechnical participation, and integration between inspections, instrumentation, and anomaly taxonomy.

The indicators, in turn, need to translate geotechnical maturity into business language. Relevant metrics include the proportion of critical audit recommendations implemented on time, the evolution of the preventive versus corrective CAPEX ratio in retaining structures, the number of operational restriction events due to geotechnical causes, the availability and reliability levels of monitoring systems, the maturity of closure plans by structure, and the degree of adherence to regulatory and ESG commitments linked to the integrity of structures.

Integration with mine planning is one of the points where it is measured whether geotechnics are truly a continuous line of work or merely a point support. Decisions regarding mining sequencing, production ramp-up, temporary stockpile locations, transportation routes, and maintenance windows have a direct impact on the stability and drainage of geotechnical structures. When planning and geotechnics operate in silos, conflicts are inevitable. When they operate in an integrated manner, the company can project scenarios with clear trade-offs between production, CAPEX, and risk.

The connection with the environment and water resources is equally relevant. Drainage solutions, geomorphological corrections, revegetation, erosion control, mitigation of impacts on water bodies, and the closure of structures all converge in the same physical territory. Without an integrated plan, the company risks adopting environmentally sound but geotechnically weak solutions, or proposing interventions that are robust from a stability standpoint but with low adherence to environmental licenses and commitments.

Finally, the connection with finance is what allows geotechnics to be transformed into a strategic component of corporate risk management. Provisions for decommissioning, multi-year CAPEX planning for reinforcements, recurring monitoring costs, geotechnical risk insurance, and analyses of extreme event scenarios are built on a consistent lifecycle plan, and not on isolated project estimates. This reduces cash flow volatility, improves predictability, and strengthens the company's position in discussions with investors and insurers.

Tangible benefits of a lifecycle approach

The transition from design logic to lifecycle logic is not merely conceptual. It produces concrete and measurable benefits in three main dimensions: risk, capital, and narrative.

In terms of risk, the main change is the shift in focus from responding to events to anticipating trends. Better calibrated models, integrated with field data and reviewed in predefined cycles, increase the ability to identify early signs of performance degradation, such as systematic changes in deformation patterns, increased pore pressures in critical zones, or the emergence of preferential flow paths. This, in turn, allows intervention before these trends translate into instabilities, operational constraints, or more serious events.

In terms of capital, lifecycle management tends to reduce the relative weight of corrective CAPEX and increase the share of planned preventive investments. The company replaces large emergency outlays, often under unfavorable negotiation conditions, with a smoother and more predictable investment trajectory. Furthermore, better-informed design and closure decisions avoid oversized or undersized solutions, which directly impact CAPEX and total cost of ownership.

In terms of narrative, a lifecycle approach strengthens the company's credibility. More recent regulations, global governance frameworks for tailings disposal facilities, and the expectations of institutional investors converge on the requirement for integrated integrity plans for these facilities, with multi-year goals, clear milestones, indicators, and transparency regarding progress and challenges. Companies that operate with a one-off project logic tend to present fragmented responses. Companies that operate with a lifecycle logic are able to demonstrate trajectory, learning, and the capacity for course correction. incorporating the vision of international guidelines (CDA, ICOLD, GISTM/ICMM), which aim at the safety of geotechnical structures as part of a mine's life cycle.

Additionally, geotechnical maturity becomes a competitive differentiator. In markets where geotechnical events have become triggers for significant value losses, the ability to demonstrate structured risk management of retaining structures is a relevant factor in credit, insurance, and social license analyses. The discussion shifts from "we meet the minimum regulatory requirements" to "we have a risk management system aligned with the best global standards."

How VinQ supports the transition from design logic to lifecycle.

Transitioning from project-oriented geotechnics to lifecycle-oriented geotechnics requires both technical depth and organizational design capabilities. VinQ positions itself as a partner in this transformation through three pillars of action.

The first pillar is the design of the geotechnical lifecycle roadmap. Instead of starting with the delivery of an isolated study, VinQ conducts a structured diagnosis that maps critical structures, reviews existing studies and data, assesses the consistency of the geotechnical model, identifies investigation and monitoring gaps, analyzes the treatment given to recommendations from independent audits, examines change management and anomaly response routines, and maps interfaces with planning, environment, and finance. Based on this diagnosis, it builds, together with the client, a two- to three-year plan with prioritized initiatives, milestones, indicators, and estimates of effort and investment.

The second pillar is acting as a technical management office, a "geotechnical PMO" for retaining structures and other relevant assets. VinQ helps organize and prioritize the portfolio of demands, structures terms of reference that preserve methodological coherence, supports the selection and coordination of specialized consultants when necessary, reviews studies from a lifecycle perspective, and ensures that results feed into the corporate geotechnical model and action plans. This reduces rework, avoids redundant or contradictory analyses, and increases the conversion rate of diagnosis into decision.

The third pillar is ongoing support through long-term contracts with well-defined milestones. This support may include periodic geotechnical risk reviews, technical support in interactions with regulators and independent auditors, support in situations of operational criticality, mentoring to strengthen internal teams, participation in corporate risk committees, contribution to the preparation and review of closure and post-closure plans, and support in building the technical narrative for boards and investors. The relationship ceases to be transactional and becomes a lifecycle partnership.

If your operation still finds itself in a "firefighting" scenario involving geotechnical issues, with repetitive studies, recurring recommendations, frequent corrective interventions, and increasing pressure from regulators, communities, and the market, the problem is not just technical. It's a management model issue.

VinQ can help redesign this model, connecting decisions, data, and governance throughout the entire lifecycle of structures. Geotechnical engineering then ceases to be a set of one-off opinions and reports and becomes a structuring discipline for risk management and value creation, from prospecting to post-closure.