Matthew Spalding expanded material capabilities in the GTNewHorizons/GT5-Unofficial and NewHorizonsCoreMod repositories, focusing on integrating deepslate materials and restructuring mineral processing workflows. He implemented new mineral recipes and updated cross-repository dependencies to ensure compatibility with Galacticraft, using Java and Gradle for dependency management and mod development. His work aligned material definitions and processing logic between core mod and game integration layers, improving ecosystem coherence and enabling richer gameplay progression. By delivering review-ready changes with clear commit messages, Matthew established a solid foundation for ongoing content expansion and maintained a high standard of technical depth in recipe implementation and game modding.