The source divides its subject into roadway excavation and block mining. This page explains that relationship at classification level only. It is not an underground mine design, excavation sequence, ground-control plan, or authorization to perform work.
Two stages named by the archive
- Stage A
Development roadway
The archive describes a rectangular development roadway whose purpose is to create working space for equipment and additional free surfaces for later separation work. Its references to a starting face with one vertical free surface and a later condition with two free surfaces are preserved as archived planning language, not as dimensions, geometry criteria, or construction instructions.
- Stage B
Block mining
After development, the record places block mining as the principal extraction stage and says it follows the archive's open-pit depression method. No method details, applicability test, equipment configuration, cut order, or support design are frozen. The relationship is therefore descriptive: development is presented as creating context for later separation, while current engineering must define whether and how that concept applies.
Planning topics listed separately
The source also names several matters associated with underground marble mining. They are best read as subjects that a current engineering record would need to address, not as recommendations from this page.
Underground facilities
The archive recognizes facilities as part of mine development but gives no system list, capacity, layout, or acceptance basis.
Roadway development
Development is identified as a prerequisite topic. Dimensions, access, ground conditions, support, ventilation, drainage, and construction controls are outside the frozen evidence.
Ore-body selection
The source mentions selecting higher-quality ore-body areas, avoiding joint fissures, and retaining defective ore bodies. It supplies no classification rule, mapping standard, sampling record, or decision threshold.
Later separation work
Additional free surfaces are linked conceptually with later block separation. The archive does not establish a cut sequence, machine choice, operating parameter, or safe-work method.
What must be deferred to current engineering
A project-specific underground design depends on site investigation, applicable law and standards, geotechnical interpretation, access and emergency planning, ground support, ventilation and services, equipment envelopes, sequencing, and competent authorization. None of that information is supplied by the frozen article source. This candidate intentionally provides no dimensions, calculations, cutting settings, excavation steps, or safety procedure.
The archived rectangular-roadway and free-surface language must not be generalized to another deposit. Even where the terms appear familiar, their suitability and meaning can only be established in the controlled project documents for the actual site.
