improvement from the first quarter of fiscal 2019. Heavy Materials operating earnings decreased 5% to $40.6 million due primarily to increased fixed and freight costs coupled with significant wet weather throughout the quarter, which hampered Concrete and Aggregates sales volume.
Cement revenue for the quarter, including Joint Venture and intersegment revenue, was up 5% to $195.3 million, reflecting higher sales prices and improved sales volume. The average net sales price for the quarter improved 1% to $109.70 per ton. Higher freight costs affected net cement prices by approximately $1 per ton during the quarter. Cement sales volume for the quarter was a record 1.6 million tons, up 3%.
Operating earnings from Cement for the first quarter were $36.1 million, 3% below the same quarter a year ago. The decline was primarily due to increased fixed costs and freight costs. Flooding in the Midwest disrupted transportation routes in our markets, causing delays and increasing transportation costs. The Company anticipates some of the disruption will continue into the fall.
Concrete and Aggregates revenue for the first quarter of fiscal 2020 was $39.4 million, a decrease of 3%. First quarter operating earnings were $4.4 million, a 19% decline, reflecting lower sales volume partially offset by improved concrete pricing. Our primary concrete and aggregates markets experienced heavy rainfall during the quarter, which hampered our ability to move product.
Light Materials: Gypsum Wallboard and Paperboard
Revenue in the Light Materials sector, which includes Gypsum Wallboard and Paperboard, declined 10% to $152.4 million. The decrease reflected lower Wallboard sales volume and net sales prices. The average Gypsum Wallboard net sales price for the first quarter of fiscal 2020 was $150.96 per MSF, a 6% decline. Gypsum Wallboard sales volume was 660 million square feet (MMSF), down approximately 7%. We believe the decline in wallboard sales volume versus the prior-year period was primarily due to a shift last year in the timing ofpre-buying activity ahead of our July 2018 wallboard price increase.
The average Paperboard net sales price this quarter was $510.32 per ton, down 4%. Paperboard sales volume for the quarter decreased 1% to 81,000 tons.
Operating earnings were $47.9 million in the sector, a decrease of 21%, reflecting lower Wallboard sales volume and prices, partially offset by lower operating costs. The reduced operating costs were primarily related to lower recycled fiber costs during the quarter.
Oil and Gas Proppants
The Oil and Gas Proppants segment reported revenue of $15.2 million, a decrease of 45%. This decline primarily resulted from a 45% decrease in average Frac Sand sales prices, partially offset by an 11% improvement in Frac Sand sales volume. The first quarter operating loss of $3.7 million included $3.8 million of depreciation, depletion and amortization.
Planned Separation of Heavy Materials and Light Materials Businesses
As previously announced on May 30, 2019, the Company plans to separate its Heavy Materials and Light Materials businesses into two independent, publicly traded corporations by
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