Mining generates significant amounts of waste that can represent a source of contamination for areas close to the extraction area, generating a negative impact both on the environment and the health of people. This study aims to evaluate the radiological risk derived from exposure to natural radionuclides contained in tailings from Peruvian gold mines and to establish whether the tailings can be used as raw materials in building materials. The mine tailings come from a mining project in the northern highlands of Peru. Radon exhalation was measured using Rad7 in a closed chamber and activity concentration of ²²⁶Ra, ²³²Th, and ⁴⁰K radioisotopes by gamma spectrometry using NaI 3” × 3” detector. Maximum activity concentrations measured for ²²⁶Ra and ²³²Th were 15.38 Bq kg⁻¹ and 11.9 Bq kg⁻¹, respectively; meanwhile, activity concentration for ⁴⁰K ranged from 182.7 Bq kg⁻¹ to 770.8 Bq kg⁻¹. All activity concentrations were below the worldwide average except for ⁴⁰K. The radon exhalation rate varied from 2.8 to 7.2 mBq kg⁻¹ h⁻¹. The gamma index (I_γ), and radiological parameters, including the Radium equivalent activity (Ra_eq), and the external hazard index (H_ex), being below the recommended levels by UNSCEAR, ensure the safe use of these mines tailing to produce a geopolymer cement.

This research aims to implemented and improve the productivity of a company dedicated to manufacturing glass containers for the cosmetic sector. The study employs the Socio-Technical approach and Lean Manufacturing philosophy to generate operational improvements. After analyzing the company's current situation, key problems such as low productivity, quality defects, and reprocessing will be identified. Solutions using these methodologies will be proposed to enhance and optimize the production process.

The objective of this document es to evaluate the implementation of Lean Manufacturing tools in the production line of filled candies in a mass consumption food company, with the aim of improving the efficiency of the line. The diagnosis shows that the main waste of the line is overprocessing, waiting, unnecessary movements and transfers, this generated costs of S/.80,000.00, per semester, in reprocessing and overtime. As explained, the implementation of tools such as Single Minute Exchange of Die (SMED), Visual Controls and the pillars of Total Productive Management (TPM): Autonomous and Preventive Maintenance are proposed.

In the present research, asphalt briquettes were manufactured using tailings-derived filler as an aggregate. The hot mix asphalt (HMA) design corresponds to the MAC-1 type, which is intended for heavy traffic, as the study area is based on roads near mining districts where heavy transport vehicles operate at an altitude exceeding 3,000 meters above sea level. The design follows the Technical Specifications MTC EG-2013 Section 423, which specifies that the mix must be composed of stone materials such as gravel and sand that meet certain requirements. The asphalt binder used is conventional PEN 85-100 asphalt from the company Petróleos del Perú-PETROPERÚ S.A.C., which complies with the requirements of Technical Specifications Section 426. Additionally, tailings-derived filler was incorporated into the mix. The briquettes were manufactured following the methodology of the Marshall Method for hot mix asphalt.