Tesis ini membahas terkait gambaran tingkat kematangan budaya keselamatan dan kesehatan kerja (Safety Culture Maturity Level) serta kinerja keselamatan di PT. X, sebuah perusahaan jasa pertambangan batubara. Penelitian dilakukan dengan pendekatan semi-kuantitatif dengan desain studi cross-sectional pada pekerja di jobsite A, B, C, D pada bulan April - Juni 2022. Variabel kematangan budaya K3 nantinya dilihat keterkaitannya terhadap kinerja keselamatan di PT.X. Hasil penelitian menunjukkan hasil tingkat kematangan budaya keselamatan di PT X pada level Proaktif dengan kinerja keselamatan berdasarkan tingkat kejadian kecelakaan yang dinilai baik, sehingga disimpulkan bahwa terdapat hubungan yang signifikan antara tingkat kematangan budaya keselamatan dengan kinerja keselamatan di PT.X

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This thesis discusses the description of the level of occupational safety and health culture (Safety Culture Maturity Level) and safety performance at PT. X, a coal mining services company. The study was conducted with a semi-quantitative approach with a cross-sectional study design on workers at jobsites A, B, C, D in April - June 2022. The safety culture maturity level variables will be seen in relation to safety performance at PT.X. The results showed that the maturity level of safety culture at PT X was at the Proactive level with safety performance based on the accident rate which was considered good, so it was concluded that there was a significant relationship between the maturity level of safety culture and safety performance at PT. X.